The Astronomik UHC is THE filter for visual observing.

You will enjoy using your Astronomik UHC filter because you will see more stars and more details in deep-sky-objects compared to using filters from all other manufacturers.

The Astronomik UHC (Ultra High Contrast) filter allows the transmission of nearly 100% of the radiation from both O-III and the H beta lines. Though the second window for the H-alpha-line is not intended for visual observing, it is important, if the filter is used with an electronic device. All annoying, scattered light from other wavelength sources, including local artificial light pollution, is reliably filtered out. With this strong blocking of the sky background an unexpected wealth of detail becomes visible for gas nebulae and planetary nebulae.

Main use

Astronomik UHC filters’ astounding high light transmission brings better views of deep-sky-objects even to small telescopes! The high transmission of our optical glass filters means that enough light is available to allow successful visual observations with telescopes beginning at 2" (50mm) aperture. Our Astronomik filters are optimized for use with telescope focal length f / ratios of f/4 to f/15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of 1:2 and more come into play. Another major advantage of our Astronomik UHC filter is the high optical quality of the filter glass. When using Astronomik UHC filters you will quickly notice the same needle-sharp stars which you are familiar with from your astronomical instrument without any filter!

Suitability

• Visual observation (dark skies): Very good, for telescopes of all apertures and high exit pupil
• Visual observation (urban skies): Very good, for telescops from 100 mm aperture
• Film photography: Reasonable, but very long exposure time
• CCD photography: Good, when used with an additional IR-block-filter
• DSLR photography (original): Good, colour balance shifted but contrast enhanced
• DSLR photography (astro modified): Very good, colour balance is near perfect
• DSLR photography (MC modified): Good, when used with an additional IR-block-filter
• Webcam / Video (Planets): Unsuitable
• Webcam / Video (Deep Sky): Good, if light pollution is a big problem

Technical Data

• typ. 95% transmission at 486nm (H-beta)
• typ. 95% transmission at 496nm (OIII)
• typ. 95% transmission at 501nm (OIII)
• typ. 95% transmission at 656nm (H alpha)
• optimum position of transmission for telescopes with focal ratios from f/10 to f/3,5
• Entire Blocking of annoying wavelengths
• Ideal All-round Deep Sky filter even for small telescopes
• Not sensitive to humidity or aging
• Scratch-resistant!
• Excellent carrier material. The optical performance of your telescope is not reduced by the filter in any way.
• Parfocal with other Astronomik filters
• Glass thickness: 1mm
• Completely resistant against high humidity, scratches and aging effects
• Diffraction limited, the filter will not reduce the optical performance of your telescope!
• Astronomik filters are delivered in a high-quality, long lasting, filter box

The Astronomik H-alpha filter is a narrow band filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.

The full width at half-maximum (FWHM) of 12nm is optimized for the use with common CCD cameras and allows the use of very fast optics. It should be noted that the filter has a transmission of up to 99%.Another advantage of the 12nm filters is the availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our 6nm filter you often won’t find a usable guidestar.The range of application extends from 1:2.8 to 1:15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of 1:2 and more come into play.

Main use

The Astronomik H-alpha-CCD (12nm version) increases the contrast between objects, in this case between the H-alpha emission line and the skyglow background. Our Astronomik H-alpha-CCD (12nm version) completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow.

Other uses

• When using the OIII CCD and the SII-CCD filters you can obtain three-color images of emission line objects (gas nebulae) from locations with very strong light pollution. To do so, you would take an image in three different wavelengths, select each one as a color-channel in Photoshop and paste them together as a color image.
• The Astronomik H-Alpha filters may NOT be used for solar observation.
• If you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel.

Suitability

• Visual observation (dark skies): Unsuitable
• Visual observation (urban skies): Unsuitable
• Film photography: Reasonable, but very long exposure times
• CCD photography: Very good, huge contrast enhancement at H II-emission nebulas
• DSLR photography (original): Good, reduced sensitivity in the H-alpha band
• DSLR photography (astro modified): Very good, huge contrast enhancement at H II-emission nebulas
• DSLR photography (MC modified): Very good, huge contrast enhancement at H II-emission nebulas
• Webcam / Video (Planets): Unsuitable
• Webcam / Video (Deep Sky): Good, good contrast enhancement with bright objects

Technical Data

• typ. transmission of more then 95% at the H-alpha line (656nm)
• Complete blocking from all disturbing wavelengths in the infrared
• Parfocal with other Astronomik filters
• Glass thickness: 1mm
• Completely resistant against high humidity, scratches and aging effects
• Diffraction limited, the filter will not reduce the optical performance of your telescope!
• Astronomik filters are delivered in a high-quality, long lasting, filter box
• Since 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past

Optolong UV/IR Cut filter is designed for ultraviolet and infrared wavelength blocking to improve sharpness of the image as most of the optics are designed for the visible spectrum, because it’s very difficult to create a lens with the same focal point for the visible and IR spectrum.

It is used on a digital camera and the video, which do not have an IR protection filter toward an image sensor or were remodeled. This is important because unfiltered CCD and CMOS sensors are extremely susceptible to UV and IR rays just outside the visible spectrum that can have a very negative impact on image quality.

Main Use and Performance

Suitable for color CMOS and CCD cameras and modified DSLRs.

Use with monochrome CCD for astrophotography.

Available to assist in focusing.

Act as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.

WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

Dark Filter 1.25 inch

Our 1,25" (M28,5) filters fit perfectly in all 1,25" (M28,5) filter wheels of the brands ZWO, QHY, QSI, Starlight Xpress, SBIG, Moravian and Atik.

The orientation of the filter in the filter wheel does not matter. It does not change the optical performance.

Dark Filter 2 inch

Our 2" (M48) filters fit perfectly in all 2" (M48) filter wheels of the brands ZWO, QHY, QSI, Starlight Xpress, SBIG, Moravian and Atik.

The orientation of the filter in the filter wheel does not matter. It does not change the optical performance.

Dark filter 31mm

Our 31mm filters fit perfectly in all 31mm filter wheels of the brands ZWO, QHY, QSI, Starlight Xpress, SBIG, Moravian and Atik. The design with protective ring and blackened filter edges prevents stray light, the filters are mechanically protected and easier to handle.

The orientation of the filter in the filter wheel does not matter. It does not change the optical performance.

Dark filter 36mm

Our 36mm filters fit perfectly in all 36mm filter wheels of the brands ZWO, QHY, QSI, Starlight Xpress, SBIG, Moravian and Atik. The design with protective ring and blackened filter edges prevents stray light, the filters are mechanically protected and easier to handle.

The orientation of the filter in the filter wheel does not matter. It does not change the optical performance.

L-eNhance filter
The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateur astrophotographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters, and a filter wheel.

Optolong L-eNhance filter provides an economical and practical solution for amateurs. It is a dual-band pass filter that has been designed for DSLR (digital SLR), color CMOS, and monochrome CCD cameras. The convenience and cost-effectiveness of this filter allow amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. Optolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact of light-polluted skies.

Hydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substances in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, keeping H and O is meaningful for the exploration of life.
Therefore, we highlight H-a, H-b, O3, and O2, and reduce the signal of sulfur.

2. Spectrum and Characteristic
Substrate: B270
Thickness: 1.85mm
Tpeak: T>90%
Blocking range: 300-1000nm
Blocking depth: light pollution line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism: 30s

How to read the chart?

▲The horizontal axis is the Wavelength in Nanometers(nm).

▲The vertical axis is transmission in %.

▲The WHITE line shows the transmission of the filter. The artificial emission lines are shown in Yellow. The emission lines from the constellation are shown in GREEN, BLUE, AND RED.

SKU: 13801

Optolong L-Pro 1.25 inch is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters.

Warning - Do not use this filter for solar purposes !

Optolong L-Pro (L-Professional) filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.

Optolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.

• Optical glass fine material
• Spectrum: 380-750nm
• Surface Quality: 60/40 (Refer to MIL-O-13830)
• Fine-optically polished to ensure accurate 1/4 wavefront and < 30 seconds parallelism over the both surfaces
• High transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm&500nm, SII 672nm and H-beta 486nm).
• Precision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).

Antlia LRGB-V Pro 系列滤镜专为使用 CCD 和 CMOS 传感器的单色相机而设计。适用的传感器包括 KAF/KAI 传感器、Sony IMX 传感器、GSENSE 和其他传感器制造商。LRGB-V Pro 套件旨在大致均衡来自红色敏感 CCD 探测器通量的 RGB 响应。结果是，您可以实现 1:1:1 均衡的 RGB 曝光，同时具有简化的后期处理和缩短的成像时间的优势。新的 LRGB-V Pro 系列滤镜在绿色和红色通道之间具有精心设计的光谱间隙，以最大限度地减少光污染的影响并提供有用频率的高透射率。滤镜的设计最大限度地捕捉了较暗星系和星云发射的细节。LRGB-V Pro 系列滤镜保证 B 和 G 滤镜中 OIII 波段的高透射率（蓝色和绿色的 OIII 信号 >95%）。B 通道的带宽变窄是为了改善由于 B 通道过度曝光而导致的恒星周围的蓝色通道溢出（光晕）。 Antlia LRGB-V Pro 系列滤光片通过 G 和 R 滤光片之间的宽间隙设计阻挡了 589nm 左右的发射线，从而抑制了高压钠灯和汞路灯的光污染，并实现了更自然的色彩平衡。基板厚度的均匀性使所有 Antlia 滤光片都具有良好的共焦性能。

LRGB-V Pro系列套装的亮点

1. 优质镀膜技术和精细抛光的基片 我们优化了质量选择流程，以确保高度均匀的玻璃基片。我们采用先进的光学镀膜技术和双面精密抛光，使所有滤镜均具有一致的共焦和光学性能。 2. 三个 RGB 通道中的每一个通道都实现了最大化的色彩平衡和对比度以及出色的 S/N 性能 玻璃基板的两侧沉积了数十层涂层，使 LRGB-V Pro 滤镜能够实现高 SNR。防反射涂层和精心设计的光谱间隙可最大限度地减少不必要的光散射，并最大限度地提高每个滤镜通道的有用信号数据。

3. 更紧密的星体轮廓和减少光晕 LRGB-V Pro系列套装的截止率经过高级设计，可最大限度地减少明亮星体周围的光晕并减少星体膨胀。我们精心设计的蓝色通道传输特性针对的是蓝色星体膨胀问题。

用途与性能：

1. 专为单色CCD和CMOS相机设计

2. 天体、星系、星团和星云的出色成像色彩

3. AR增透膜设计，减少二次反射和星晕

4. R-Filter 提供最大程度的 H-alpha 和 S II 发射传输

5. B/G 重叠使 OIII 线的能量加倍

6. 平衡的 RGB 设计为大多数望远镜光学系统提供 1:1:1 的曝光时间

7. 所有 Antlia LRGB-V Pro 滤镜的边缘均经过涂黑处理，以消除杂散光的内部反射

8. 四个 LRGB 滤光片的基板厚度均保持严格的公差

9. 不推荐用于太阳观测和成像

10. 不建议目视观察

重要提示：使用任何共焦滤光片时，用户在长时间成像过程中仍可能会遇到滤光片之间的焦点偏移。重要的是要记住，由于望远镜筒和玻璃光学元件之间的差异收缩，温度变化会改变光路的长度。建议摄影师每 1 到 2 小时手动或自动在软件中检查一次焦点。如果将望远镜从温暖的环境带到室外，则需要更频繁地检查焦点，直到设备稳定在接近环境温度为止。

技术规格：

基础基材：光学基材

滤光片厚度：1.25'' 为 2mm+/-0.05mm

表面质量：S/D（划痕/凹陷）= 60/40（参考 MIL-O-13830）

透射波前：Lambda/4 或更好。

平行度：小于 30 角秒

单面/无胶基材

L-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter.

Unlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines.The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.

Hydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life.
Therefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.

Spectrum and Characteristics

• Sbustrate: B270
• Thickness: 1.85mm
• Tpeak: T>90%
• Blocking range: 300-1000nm
• Blcoking depth: light pollution line blocking >99%
• Surface quality: 60/40
• Transmitted Wavefront RMS: λ/4

Astronomik now offers you a range of three different UV+IR blockers as Luminance filters. The different spectral window of each new Luminance filters is designed to tune your setup to get the sharpest image from any optical design and any camera.

The Luminance channel is probably the most important for a great final image! You want as much signal as possible so the filter should have the highest transmission possible with a wide spectral bandpass. This combination provides the greatest sensitivity and gives you the highest photon counts on your pixels. While the high transmission level is a great aspect of the new Astronomik Luminance filters, not all optical instruments or additional optical elements like correctors, field-flatteners or reducers, have perfect colour correction so it can be the width of the spectral band pass of  the Luminance filter that can cause problems. A band pass that is too wide will allow the transmission of incompletely focused light (Chromatic aberration), making stars appear soft or bloated. In such cases image processing can become difficult, so having a slightly narrowed spectral window in your Luminance filter can reduce or eliminate this damaging effect.

To give you all the tools to gather the best data possible we have expanded our line of Luminance filters: Now you can select a Luminance filter perfectly matched to the kind of telescope you use, to get the highest signal and sharpest image for the Luminance channel!
Depending on the color correction of your scope you may use a wider spectral window for the Luminance data. The L1 filter has the widest spectral window, the L2 is about the same as our current L-Filter and the L3 is much narrower.
If you use an optical system that is completely free of any chromatic aberration you should get an L1 filter for your setup. For general use the L2 filter is well suited to most optical systems with a corrector, flattener or reducer in the optical train while the L3 filter is designed for users of refractors with a less-than-perfect color correction and in combination with the new Deep-Sky RGB filters, the L3 filter will minimise the problem of bluish halos around stars.

The transmission curve characteristics and coatings on the new Luminance filters have been designed and engineered in such a way that no halos or reflections will be visible. Even with bright stars in the field of view you will be able to reveal the faintest structures in nebulas or galaxies.

Like all Astronomik Filters, the new Luminance filters are made using an extremely durable and scratch resistant coating, deposited on the finest polished optical substrate, which is free of any striae or internal strains. All substrates are made to exactly the same thickness, so all of our filters are parfocal.

Additional note for observers working under light polluted skies:
If your observing site suffers from light pollution you should try to use our CLS-CCD as a replacement for the Luminance filter. The transmission curve of the CLS-CCD will give you approximately the same amount of energy in all three colour channels while blocking nearly all unwanted artifical light pollution. Customers who replaced the Lx filter with the CLS-CCD are amazed by the increased quality of their data. This small change gives you the opportunity to take much deeper images from your current observing site.

Antlia 3nm Pro 超窄带 1.25 英寸滤光片组包括以下物品：

• Antlia 1.25 英寸 H-Alpha 3nm 滤镜
• Antlia 1.25 英寸 OIII 3nm 滤镜
• Antlia 1.25 英寸 SII 3nm 滤镜

Antlia SHO Pro 窄带滤光片将 FWHM（半峰全宽）优化至 3nm 带通。随着带宽变窄，3nm Pro 窄带滤光片通过降低不需要的背景信号来增强发射目标的对比度。Antlia SHO 3nm Pro 滤光片旨在在 671.6nm 线上提供 88% 的透射率，为您提供最大信号和清晰的星云结构。

传统的较宽窄带滤光片由于强烈的（中心波长 (CWL) 偏移）会导致严重的传输损失。我们保证在中心带宽 1nm 范围内 T>88%，这意味着 3nm Pro 窄带滤光片可以保证高透射率，适用于长焦比和快速光学系统。蓝移数据显示，Antlia 3nm Pro 滤光片几乎可以与所有速度高达 f/3 的系统一起使用，发射信号损失最小，并满足 Hyperstar 和 RASA 等快速光学器件的要求。

带外阻断规格为 OD5（0.001%），可提供出色的 SNR（信噪比）和有效截止率，以最大限度地减少来自其他波长的干扰。改进的锐利截止天文摄影 3nm Pro 滤镜旨在最大限度地减少明亮恒星周围的光晕。

用途与性能：

• 高透射率和最小带宽可最大程度地提高对比度
• 陡峭的光谱轮廓最大程度地减少了明亮恒星周围的光晕
• 单一基板可消除内部反射
• 窄带物体：发射星云、行星、沃尔夫-拉叶星云和超新星遗迹
• 在光污染区域和黑暗场所使用
• 月亮升起时延长成像时间
• Antlia 窄带 Pro 滤波器可用于 F/3 系统，信号损失轻微
• 所有 Antlia 窄带滤光片的边缘均经过涂黑处理，以消除杂散光的内部反射
• 卓越的光学可靠性减少了后期图像处理

它是一种 3nm 双波段，旨在大幅减少光污染的影响，3nm 将星云的辐射隔离为 H-Alpha（红色）和 OIII（绿-蓝）。它可以阻挡光污染，最大化​​星云信号，并使天空背景变暗。它还可以阻挡汞蒸气灯、高压和低压钠蒸气灯的人造光以及由我们大气中的中性氧排放引起的不必要的自然光。最大化星云在 OIII（496nm 和 500nm）和 H-alpha（656nm）中的主要发射线的传输。但是，与 DSLR、彩色/MONO CMOS 和 CCD 一起使用时，此滤镜不适用于快速比率系统。

L-Ultimate的优点在于只通过发射线OIII(500.7nm)和Ha(656.3nm)，这样其他光污染发射线全部被排除，成像时只捕捉到星云的发射和反射信号，因此图像的天空背景更暗，最大程度提升了星云的对比度和信噪比。在重光污染区域，该产品还能选择性地过滤通过星云发射线的光污染和杂波信号，最终避免光污染对天文摄影的影响。

与双窄带 L-eNhance 和 L-eXtreme 系列不同的是，L-Ultimate 是一款双 3nm 带宽滤镜，只通过 Ha 和 OIII 发射线。您将获得更暗的天空背景，图像对比度更高，对星星的抑制也更强。L-Ultimate 在光晕性能方面也进行了优化，因此在对亮星物体进行拍摄时不会出现明显的光晕。

特征

Astronomik now offers you a range of three different UV+IR blockers as Luminance filters. The different spectral window of each new Luminance filters is designed to tune your setup to get the sharpest image from any optical design and any camera.

The Luminance channel is probably the most important for a great final image! You want as much signal as possible so the filter should have the highest transmission possible with a wide spectral bandpass. This combination provides the greatest sensitivity and gives you the highest photon counts on your pixels. While the high transmission level is a great aspect of the new Astronomik Luminance filters, not all optical instruments or additional optical elements like correctors, field-flatteners or reducers, have perfect colour correction so it can be the width of the spectral band pass of  the Luminance filter that can cause problems. A band pass that is too wide will allow the transmission of incompletely focused light (Chromatic aberration), making stars appear soft or bloated. In such cases image processing can become difficult, so having a slightly narrowed spectral window in your Luminance filter can reduce or eliminate this damaging effect.

To give you all the tools to gather the best data possible we have expanded our line of Luminance filters: Now you can select a Luminance filter perfectly matched to the kind of telescope you use, to get the highest signal and sharpest image for the Luminance channel!
Depending on the color correction of your scope you may use a wider spectral window for the Luminance data. The L1 filter has the widest spectral window, the L2 is about the same as our current L-Filter and the L3 is much narrower.
If you use an optical system that is completely free of any chromatic aberration you should get an L1 filter for your setup. For general use the L2 filter is well suited to most optical systems with a corrector, flattener or reducer in the optical train while the L3 filter is designed for users of refractors with a less-than-perfect color correction and in combination with the new Deep-Sky RGB filters, the L3 filter will minimise the problem of bluish halos around stars.

The transmission curve characteristics and coatings on the new Luminance filters have been designed and engineered in such a way that no halos or reflections will be visible. Even with bright stars in the field of view you will be able to reveal the faintest structures in nebulas or galaxies.

Like all Astronomik Filters, the new Luminance filters are made using an extremely durable and scratch resistant coating, deposited on the finest polished optical substrate, which is free of any striae or internal strains. All substrates are made to exactly the same thickness, so all of our filters are parfocal.

Additional note for observers working under light polluted skies:
If your observing site suffers from light pollution you should try to use our CLS-CCD as a replacement for the Luminance filter. The transmission curve of the CLS-CCD will give you approximately the same amount of energy in all three colour channels while blocking nearly all unwanted artifical light pollution. Customers who replaced the Lx filter with the CLS-CCD are amazed by the increased quality of their data. This small change gives you the opportunity to take much deeper images from your current observing site.

The Astronomik ProPlanet 642 BP is the lastest addition to the family of Astromik ProPlanet IR-pass filters. The filter thrills because of it´s wide range of applikations for daylight IR-Photography, high-resolution lunar and planetary imaging and for taking beautifull and deep images of H-alpha regions when used for Astrophotography.

What does BP stand for ?

"BP" are short for "Bandpass": The filter gives you a 200nm spectral window from 642nm to 842nm. Contrary to the other two ProPlanet filters it blocks the longer infrared. Together with the Astronmik ProPlanet 742 and the ProPlanet 807 you can now have three choices to match your needs when imaging in the IR. The Astronomik ProPlanet 642 BP will be the right choice for the best image quite often!

The Astronomik ProPlanet 642 BP will give you three filters in one single product! Depending on your camera, the Astronomik ProPlanet 642 BP is a great tool either for daylight IR-imaging with your digital camera, or it will reduce seeing effects and enhance contrast when used for lunar- and planetary imaging, and third it will be a very good and low-priced H-alpha Filter for getting started in Deep-Sky Astrophotography of H-alpha regions.
Due to our skillfull developement with lot´s of tests we reached the goal to give you a filter which will do a perfect job to deliver amazing images.

Daylight IR-imaging:

• contrasty images with a great rendition of colors
• Clear "Wood-Effect" images
• Not Hot-Spot from longer IR!
• Short exposure times, about the same as normal VIS-imaging
• perfect choice for Infrared-Videos

High-resolution Lunar and planetary imaging:

• short Exposure times
• effective reduction of Seeing
• enhanced contrast
• no ghosts and best sharpness due to blocking the longer IR

Deep-Sky Astrophotography of HII regions:

• best transmission of the H-alpha line at 656nm
• about 40nm FWHM with astro-modified DSLRs
• amazing contrast under lightpolluted skies or moonlight
• low priced filter for getting started in H-alpha imaging
• easy focussing using camera display plus LiveView!

Guiding for Astrophotography:

• installing the 642BP in front of your autoguider-camera dramatically improves guiding quality, as image-motion from one frame to the next is minimized.

Technical Data

• more then 96% transmission for wavelengths of 642nm to 840nm
• blocking of wavelengths between 350nm and 630nm
• Parfocal with other Astronomik filters
• Glass thickness: 1mm
• Completely resistant against high humidity, scratches and aging effects
• Diffraction limited, the filter will not reduce the optical performance of your telescope!
• Astronomik filters are delivered in a high-quality, long lasting, filter box
• Since 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past

The new Astronomik Deep-Sky RGB filters are the result of a long and detailed process of research and development. We have created the most advanced set of RGB filters for Deep-Sky imaging available today.
The transmission curves of the three filters are designed to give you strong and vivid colors with a strong reinforcement of the most important emission lines. Data taken with the new Astronomik Deep-Sky RGB filters is easier to process into a beautiful final masterpiece.

Feedback from our test-users and the first customers is really exciting. All of them reported smaller, sharper stars and this was one of our design goals, so these filters are designed to give you the best contrast and the smallest stars possible!

During the design of the Deep-Sky RGB filters we took a close look at the sensitivity curves of today’s popular CCD cameras. The result was we found a way to make one set of filters for all kind of sensors ranging from KAF- and KAI-sensors, to the chips made by Sony, meaning you can do 1:1:1 ratio RGB exposures with all sensors, with only minimal tweaking necessary during processing to achieve perfect colours in your image!

The transmission curve characteristics and coatings on the new Deep Sky RGB filters have been designed and engineered in such a way that no halos or reflections will be visible. Even with bright stars in the field of view you will be able to reveal the faintest structures in nebulas or galaxies

Additional to the Deep-Sky RGB filters Astronomik now offers you three different Luminance filters. The different spectral window of each new Luminance filters is designed to tune your setup to get the sharpest image from any optical design and any camera, even with instruments with less-than-perfect colour correction. (Link einfügen)

Like all Astronomik Filters, the new Deep-Sky RGB filters are made using an extremely durable and scratch resistant coating, deposited on the finest polished optical substrate, which is free of any striae or internal strains. All substrates are made to exactly the same thickness, so all of our filters are parfocal.

Astronomik Deep-Sky RGB Key features:

• Maximum transmission of up to 95%
• Ultra-Sharp, pinpoint star images
• High contrast
• Easy to process data for vivid colours in the final image
• Optimized spectral windows for max photon counts on the sensor
• Made on finest, opticaly polished glass
• Extremly durable, scratch resistant coating
• MFR Coating technique for a wide range of focal ratios

From the start, the Astronomik OIII filter has been very specifically designed for the visual observation of gaseous and planetary nebulae. The extremely narrow pass band of the two OIII lines brings a substantial contrast gain to these lines even under best observation conditions. On faint super nova remnants and faint planetary nebulae the Astronomik OIII filter will often make the difference as to whether the object can bee seen or not!

The optimal aperture ratio for the use of the filter is 1:3.7 to 1:15 with apertures of more than 6" (150mm). Transmission losses and chromatic distortions, which arise with other filters, occur with Astronomik OIII filters only when extremely bright aperture ratios of 1:3 and more come into play. The Astronomik OIII filters thus can expand the view of dispersed objects, generally speaking, to the whole visual field of view of the eyepiece and are not limited to only the center of the eyepiece.

Main use

Since enough light must be available to make use of the OIII filter it is best to use this filter with apertures of more than 6" (150mm). Smaller instruments do not gather enough light for meaningful and satisfying astronomical work. However, please note: Many experienced Deep Sky observers, with apertures of more than 10" (250mm), prefer using the OIII filter instead of the more versatile UHC filter. Due to the high optical quality of the Astronomik OIII filter substrate you will see the same needle-sharp stars as you would from your regular telescope.

Astronomik now offers you a range of three different UV+IR blockers as Luminance filters. The different spectral window of each new Luminance filters is designed to tune your setup to get the sharpest image from any optical design and any camera.

The Luminance channel is probably the most important for a great final image! You want as much signal as possible so the filter should have the highest transmission possible with a wide spectral bandpass. This combination provides the greatest sensitivity and gives you the highest photon counts on your pixels. While the high transmission level is a great aspect of the new Astronomik Luminance filters, not all optical instruments or additional optical elements like correctors, field-flatteners or reducers, have perfect colour correction so it can be the width of the spectral band pass of  the Luminance filter that can cause problems. A band pass that is too wide will allow the transmission of incompletely focused light (Chromatic aberration), making stars appear soft or bloated. In such cases image processing can become difficult, so having a slightly narrowed spectral window in your Luminance filter can reduce or eliminate this damaging effect.

To give you all the tools to gather the best data possible we have expanded our line of Luminance filters: Now you can select a Luminance filter perfectly matched to the kind of telescope you use, to get the highest signal and sharpest image for the Luminance channel!
Depending on the color correction of your scope you may use a wider spectral window for the Luminance data. The L1 filter has the widest spectral window, the L2 is about the same as our current L-Filter and the L3 is much narrower.
If you use an optical system that is completely free of any chromatic aberration you should get an L1 filter for your setup. For general use the L2 filter is well suited to most optical systems with a corrector, flattener or reducer in the optical train while the L3 filter is designed for users of refractors with a less-than-perfect color correction and in combination with the new Deep-Sky RGB filters, the L3 filter will minimise the problem of bluish halos around stars.

The transmission curve characteristics and coatings on the new Luminance filters have been designed and engineered in such a way that no halos or reflections will be visible. Even with bright stars in the field of view you will be able to reveal the faintest structures in nebulas or galaxies.

Like all Astronomik Filters, the new Luminance filters are made using an extremely durable and scratch resistant coating, deposited on the finest polished optical substrate, which is free of any striae or internal strains. All substrates are made to exactly the same thickness, so all of our filters are parfocal.

Additional note for observers working under light polluted skies:
If your observing site suffers from light pollution you should try to use our CLS-CCD as a replacement for the Luminance filter. The transmission curve of the CLS-CCD will give you approximately the same amount of energy in all three colour channels while blocking nearly all unwanted artifical light pollution. Customers who replaced the Lx filter with the CLS-CCD are amazed by the increased quality of their data. This small change gives you the opportunity to take much deeper images from your current observing site.

The CHROMA TECHNOLOGY OIII (3nm) Filter is a high-performance narrowband filter specifically designed for astrophotography and scientific imaging. Engineered with precision, this filter isolates the Oxygen III (OIII) emission line at 500.7nm, providing a tight 3nm bandwidth that significantly reduces light pollution, moonlight, and other unwanted wavelengths. The result is unmatched contrast and clarity, allowing you to capture faint nebular structures and intricate details in deep-sky objects.

Crafted with advanced multi-layer dielectric coatings, the CHROMA OIII filter offers exceptional transmission and durability, ensuring optimal performance for years of use. Its strict quality control standards make it an ideal choice for professional and amateur astrophotographers alike, delivering sharp, high-contrast images with minimal halos or reflections.

The UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.

Main Use and Performance

Suitable for color CCD cameras and unmodified DSLRs.

UHC with narrower passband provides higher contrast than CLS. Thus it is more suitable for urban environment where you suffer from severe light pollution.

UHC has a substantial red passband and offer superb views for objects like the Orion Nebula (M42).

Light pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

The Astronomik CLS CCD is suitable under light-polluted skies for DSLR Cameras, which have been remodeled for astronomical use. The filter enhances the contrast between all deep-sky objects and the background. 

The CLS-CCD Filter enhances the contrast between astronomical objects and the background. Due to the wider transmission curve compared to UHC filters, a greater amount of light will pass the filter. Stars will be less dimmed. This filter has been optimized to block as much spurious light as possible and simultaneously provide the best performance for 'useful' light. A good filter for DSLR-, CCD- and film b/w-photography as well as observation of deep-sky-objects with telescopes or photo lenses of all aperture f/2 and above.

Main use

The filter blocks completely emission lines of artificial light sources like streetlights (e.g. sodium- and mercury-vapor) as well as the airglow. All 'important' emission lines as well as the spectral range of the night-adapted eye are beeing passed. The supplementary IR-blocking layer allows the use for DSLR- and Webcams without an integrated IR-block filter.

Other uses

• Easier resolution of Double Stars.
• With the EOS-Clip model, photography with DSLR cameras is feasible even unter extreme light-polluting conditions without shifting the white balance.
• The 1,25" and 2" socket models can be used for observations from light-polluted areas.
• If you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel

Alternatives

CLS: For cameras with an integrated IR-filter or for visual observation.

Suitability

• Visual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)
• Visual observation (urban skies): Reasonable, an UHC-E or UHC filter is more suitable
• Film photography: Very good, colour balance is near perfect
• CCD photography: Very good, optimized rejection of light pollution
• DSLR photography (original): Good, colour balance shifted but contrast enhanced
• DSLR photography (astro modified): Very good, colour balance is near perfect
• DSLR photography (MC modified): Very good, colour balance is near perfect
• Webcam / Video (Planets): Unsuitable
• Webcam / Video (Deep Sky): Very good, if light pollution is a big problem

Technical Data

• 95% transmission at 486nm (H-beta)
• 95% transmission at 496nm (OIII)
• 95% transmission at 501nm (OIII)
• 97% transmission at 656nm (H-alpha)
• pass from 450 to 520nm and from 640 to 690nm
• Parfocal with other Astronomik filters
• Glass thickness: 1mm
• Completely resistant against high humidity, scratches and aging effects
• Diffraction limited, the filter will not reduce the optical performance of your telescope!
• Astronomik filters are delivered in a high-quality, long lasting, filter box
• Since 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past

The 3nm Chroma H-alpha Filter is the pinnacle of precision for astrophotography, designed to deliver unmatched contrast and detail for capturing deep-sky objects. Its ultra-narrow 3nm bandwidth isolates the H-alpha emission line at 656.3nm with exceptional precision, effectively eliminating light pollution and other unwanted wavelengths, even in challenging imaging conditions.

Engineered with state-of-the-art coatings and superior optical quality, this filter minimizes halos, reflections, and ghosting, providing crisp, artifact-free images. Ideal for use with fast optical systems, the Chroma 3nm filter excels in revealing the intricate structures of emission nebulae and other faint targets. Its robust, weather-resistant build ensures consistent performance, whether you're imaging in a remote observatory or under urban skies.

For astrophotographers seeking the highest level of detail and contrast, the 3nm Chroma H-alpha filter is the ultimate tool to unlock the beauty of the universe.

The Chroma Technology 3nm SII filter is a high-performance narrowband filter designed for astrophotography and scientific imaging. It isolates the Sulfur II (SII) emission line at 672.4nm with an ultra-narrow 3nm bandwidth, delivering exceptional contrast and detail for capturing deep-sky objects, especially emission nebulae.

Engineered with precision, this filter features advanced multi-layer dielectric coatings for superior light transmission and durability. Its ultra-narrow design significantly reduces light pollution and moonlight interference, making it ideal for imaging under challenging conditions. Whether you're working in urban environments or under pristine dark skies, the Chroma 3nm SII filter ensures sharp, halo-free images with minimal reflections, making it an essential tool for astrophotographers aiming for stunning, detailed results.

The Chroma Luminance Filter is a premium optical filter designed to deliver the highest level of clarity and precision for astrophotography. Engineered with ultra-high transmission and strict wavelength control, this filter allows the full visible spectrum to pass while effectively blocking unwanted infrared (IR) light, ensuring sharp, high-contrast images.

Key Features:

• Superior Optical Quality: Manufactured to the highest standards for minimal wavefront distortion and optimal image sharpness.
• Maximized Transmission: Provides exceptional light throughput for increased signal-to-noise ratio in luminance data.
• Infrared Blocking: Designed to cut unwanted IR light, reducing halos and enhancing contrast in deep-sky imaging.
• Precision Coatings: Hard-coated for durability and consistent performance over time, even in harsh observing conditions.
• Seamless Integration: Compatible with monochrome CCD and CMOS cameras for high-resolution astrophotography.

Perfect for imaging faint deep-sky objects, the Chroma Luminance Filter ensures exceptional detail and contrast, making it an essential component for any astrophotographer’s filter set.

The Chroma Technology Green Filter is a high-precision astrophotography filter designed for LRGB imaging with monochrome CCD and CMOS cameras. Engineered for maximum light transmission in the green wavelength range, this filter enhances color accuracy and contrast, delivering stunning deep-sky images with exceptional detail.

Key Features:

• High Transmission Efficiency: Optimized to capture green wavelengths with minimal signal loss.
• Precision Optical Design: Ensures sharp, high-contrast imaging with minimal wavefront distortion.
• Advanced Anti-Reflection Coatings: Reduces halos and reflections for cleaner, more detailed astrophotographs.
• Infrared (IR) Blocking: Effectively eliminates unwanted IR contamination for accurate color reproduction.
• Durable & Reliable: Hard-coated for long-lasting performance in demanding observing conditions.

Perfect for astrophotographers seeking optimal color balance and detail, the Chroma Technology Green Filter is an essential tool for producing stunning LRGB deep-sky images.

The Chroma Technology Blue Filter is a high-performance astrophotography filter designed for precise LRGB imaging with monochrome CCD and CMOS cameras. Engineered for maximum light transmission in the blue wavelength range, this filter enhances color accuracy and contrast, ensuring crisp and vibrant deep-sky images.

Key Features:

• High Transmission Efficiency: Optimized for capturing blue wavelengths with minimal signal loss.
• Superior Optical Quality: Minimizes wavefront distortion for sharp, high-contrast imaging.
• Advanced Anti-Reflection Coatings: Reduces halos and reflections for cleaner, more detailed astrophotographs.
• Infrared (IR) Blocking: Effectively eliminates unwanted IR contamination, ensuring accurate color reproduction.
• Durable & Long-Lasting: Hard-coated for superior durability and consistent performance in all observing conditions.

Designed for astrophotographers who demand precision and clarity, the Chroma Technology Blue Filter ensures exceptional color balance and detail in LRGB deep-sky imaging.