New 2″ filter drawer featuring the anti-light-leaking design that can effectively solve the light leaking issue under long exposure.

Two sizes available: M42 and M54.

Double strong magnets adopted for stronger adsorption, easier installation and pulling out.

Lock screw on the side for you to adjust the tension of the holder to eliminate gap. Double insurance.

What’s in the Box?

M42 filter drawer:Filter drawer *1M48-M42F adapter *1

ZWO 1.25″ IR UV CUT filter is suitable for colour camera with AR protect window.

The ZWO IR Cut Filter 1.25 blocks infrared light from reaching the sensor of your CCD or CMOS camera or your expensive H-alpha filter. When imaging, the addition of this simple and inexpensive accessory will result in sharper images, and when doing solar work, the IR Cut Filter will your protect H-alpha filter from the damaging effects of infrared radiation.

Infrared or IR light is invisible to the human eye, and so even though most telescopes are not designed to focus IR light, it does not matter when you are using your telescope visually. However, when you add a camera to the mix, its a whole other story! Unlike the human eye, a silicon sensor is very sensitive to light in the infrared portion of the spectrum, and that is a problem because infrared images are blurry as all get out. That means your nice, sharp visual light image is degraded by the addition of the infrared layer. This problem can easily be solved by blocking the infrared, and the ZWO IR Cu filter 1.25 will do just that.

The ZWO IR Cut filter is housed in a 1.25” cell, and has internal threads so that you can stack filters together. The filter comes with a protective plastic case.

ZWO IR cut filter 2 inch is suitable for colour camera with AR protect window.

The ZWO IR Cut Filter 2 inch blocks infrared light from reaching the sensor of your CCD or CMOS camera or your expensive H-alpha filter. When imaging, the addition of this simple and inexpensive accessory will result in sharper images, and when doing solar work, the IR Cut Filter will your protect H-alpha filter from the damaging effects of infrared radiation.

Infrared or IR light is invisible to the human eye, and so even though most telescopes are not designed to focus IR light, it does not matter when you are using your telescope visually. However, when you add a camera to the mix, its a whole other story! Unlike the human eye, a silicon sensor is very sensitive to light in the infrared portion of the spectrum, and that is a problem because infrared images are blurry as all get out. That means your nice, sharp visual light image is degraded by the addition of the infrared layer. This problem can easily be solved by blocking the infrared, and the ZWO IR Cut filter 2 inch will do just that.

The ZWO IR Cut filter is housed in a 2″ cell, and has internal threads so that you can stack filters together. The filter comes with a protective plastic case.

Technical Parameter:

Name: IR-cut filter

Size: 2″

Thickness: 5mm+2mm(Thread)

Thread: M48*0.75 male thread

Star Analyser 100

Since its launch in 2005, the Star Analyser 100 has introduced thousands of amateur astronomers worldwide to the fascinating field of spectroscopy. Over this period, the equipment used by amateurs has evolved with larger aperture telescopes, bigger camera sensors and close coupled filter wheels becoming more common.

For most users the SA100 is expected to continue to be the model of choice, particularly for those using cameras with small sensors, giving optimum performance for example with the SA100 mounted on the camera nosepiece.

Professional Astronomers routinely use the power of spectroscopy to reveal the secrets of the universe. Now the STAR ANALYSER can do the same for the amateur imager at an affordable price with this simple telescope attachment.

Used like a conventional 1.25 inch filter, it is the ideal accessory for today's low cost astronomical imaging cameras, webcams and video cameras.

SA 100 instructions

ZWO Duo-Band Filter is a dual narrowband filter primarily aimed at complementing our range of colour ASI cameras. The Duo-Band filter is aimed at the astronomer who may already own a One Shot Colour (OSC) camera and wants to image using narrowband techniques or emission objects without purchasing a mono camera, filter wheel and narrowband filter set.

The Duo-Band filter offers an economical entry into the world of narrowband imaging and can also offer a practical solution to imaging in light polluted urban areas.

The dual band pass nature of the Duo-Band filter passes light at Hα (656nm) and OIII (500nm) wavelength, and can reduce the interference from natural light sources such as moonlight, or artificial light pollution such as street lighting.

It can help improve the contrast and visibility of deep sky objects such as emission nebula using a OSC (One Shot Colour) camera.

If you are looking for a solution to deep sky photography in light pollution area, then ZWO Duo-Band Filter will be a great choice.

The Duo-Band filter can be used with all ASI cameras and EFW Electronic Filter Wheel and comes in 1.25” and 2” sizes.

Precision CNC machined from Aircraft grade alloys,hard anodised finished Cell with Laser engravings, finely polished optical surface to ensure 1/4 wavefront and <30 arc seconds parallelism over the both surfaces. Precise double sided coatings with anti-reflection coatings

ZWO Duo-Band Filter Technical Specification

Size: Standard 1.25”

Thickness: 1.85 mm

Bandwidth: HA (15nm) OIII (35nm)

Surface quality: 60/40 (Refer to MIL-O-13830)

Schott substrate material

More than 90% transmission at major OIII line 486.nm1, 496nm and 501nm.

More than 80% transmission at Ha line 656.3nm

Note:The incoming light transmitted through the filter should be perpendicular to the filter, or the incident angle should be less than 8°. Therefore, this product is not suitable for wide-angle or ultra wide-angle lenses.

Test Results

Images captured with ASI color cameras and Duo-Band Filters. You can see that the potential for deep space photography in strong light polluted areas is vastly improved with the Duo-Band filters.

ZWO Duo-Band Filter 2inch is a dual narrowband filter primarily aimed at complementing our range of colour ASI cameras. The Duo-Band filter is aimed at the astronomer who may already own a One Shot Colour (OSC) camera and wants to image using narrowband techniques or emission objects without purchasing a mono camera, filter wheel and narrowband filter set.

The Duo-Band filter offers an economical entry into the world of narrowband imaging and can also offer a practical solution to imaging in light polluted urban areas.

The dual band pass nature of the Duo-Band filter passes light at Hα (656nm) and OIII (500nm) wavelength, and can reduce the interference from natural light sources such as moonlight, or artificial light pollution such as street lighting.

It can help improve the contrast and visibility of deep sky objects such as emission nebula using a OSC (One Shot Colour) camera.

If you are looking for a solution to deep sky photography in light pollution area, then ZWO Duo-Band Filter will be a great choice.

The Duo-Band filter can be used with all ASI cameras and EFW Electronic Filter Wheel and comes in 1.25” and 2” sizes.

Precision CNC machined from Aircraft grade alloys,hard anodised finished Cell with Laser engravings, finely polished optical surface to ensure 1/4 wavefront and <30 arc seconds parallelism over the both surfaces. Precise double sided coatings with anti-reflection coatings

ZWO Duo-Band Filter Technical Specification

Size: Standard :2”

Thickness: 1.85 mm

Bandwidth: HA (15nm) OIII (35nm)

Surface quality: 60/40 (Refer to MIL-O-13830)

Schott substrate material

More than 90% transmission at major OIII line 486.nm1, 496nm and 501nm.

More than 80% transmission at Ha line 656.3nm

Note:The incoming light transmitted through the filter should be perpendicular to the filter, or the incident angle should be less than 8°. Therefore, this product is not suitable for wide-angle or ultra wide-angle lenses.

Test Results

Images captured with ASI color cameras and Duo-Band Filters. You can see that the potential for deep space photography in strong light polluted areas is vastly improved with the Duo-Band filters.

ZWO 1.25″ IR 850nm Pass Filter suitable for IR sensitive cameras. You don’t need to debayer and get the full resolution of this sensor when use it with a Color camera such like ASI224MC or ASI185MC. Because the QE responce of sensor beyond 850nm is all the same. So you can use a color camera as mono camera with this filter, just don’t forget to keep the WB_R and WB_B to 50 (no White Balance applied).

Product Description

New ZWO Filter Drawer Nikon with a thickness of 29mm that can be used for carrying 2” filter and connecting ASI cooled cameras to Nikon Lens.

It is compatible with all ASI cooled cameras with 17.5mm back focus distance (except ASI GT series): 1600/294/183/071/533/2600/6200/2400

It can be used with all ZWO 2” filters, including the duo-band filter, narrowband filter, IR-cut filter, etc.

If you are using 2” filters from a third party, then please make sure they meet the requirements below.

Filters are very easy and convenient to install and pull out with the ability of double strong magnetic adsorption.

The thread of the interface: M42*0.75.

You will need to use an M54M-M42F adapter (0mm) to connect the filer drawer to the full-frame camera.

Connection method:

Connecting to ASI1600/294/183/533：

Connecting to ASI6200/2400/2600/071:

*The M54M-M42F adapter is needed when connected to full frame camera ASI6200/2400.

Mechanical drawing:

ZWO FD Nikon Specifications

70mm diameter*29mm(thickness)

M42*0.75 male (external) thread (camera side)

M48*0.75 female (internal) thread (filter end)

Suitable for 2-inch astronomical filters

What’s in the box?

Star Analyser 200

Since its launch in 2005, the Star Analyser 100 has introduced thousands of amateur astronomers worldwide to the fascinating field of spectroscopy. Over this period, the equipment used by amateurs has evolved with larger aperture telescopes, bigger camera sensors and close coupled filter wheels becoming more common. The Star Analyser 200 model has been developed with these users in mind.

Using the same Paton Hawksley high efficiency blazed diffraction grating technology as the SA100, but with double the line density. The SA200 is designed for applications where it is difficult to achieve the optimum spacing needed for the SA100. The SA200 gives the same length of spectrum at half the spacing compared with the SA100.

The new ZWO LRGB Filters are designed to approximately equalize the flux of ASI1600 mono sensor

Better transmission, Better coating, Better color separation

Technical Parameter:

Name: ZWO New LRGB Filters Optimized for ASI1600(4 filters)

Size: 1.25″

Thickness: 5.5mm+2.5mm(thread)

Thread: M28.5*0.6

the RGB color combine weights will be approximately 1:1:1

• Fine-optically polished to ensure accurate 1/4 wavefront
• more than 92% transmission at passband
• Infrared wavelength 700-1100nm cut-off
• Precision off-band blocking
• Multi-layers anti-reflection coating
• Small spectral “gap” to minimize effect of light pollution
• More parfocal – thickness 1.9+/-0.03 mm

here is the the transmission curve

New from ZWO

The ZWO New EFW-EOS II adapter has been designed as a short EOS adapter for EFW & Cooled camera(6.5mm backfocus version).

Extend distance: 17.5mm

So you can use Canon Lens with ASI1600 and EFW

The Vespera light pollution filter or CLS (City Light Suppression) filter allows you to improve the quality of your photos when observing in the city or suburbs. It attenuates the effects of light pollution and thus increases the contrast between the celestial object being photographed and the background sky.

The broadband filter blocks wavelengths mainly emitted by urban night lighting or undesirable natural light, while allowing the main wavelengths from celestial objects.

The Vespera light pollution filter or CLS (City Light Suppression) filter allows you to improve the quality of your photos when observing in the city or suburbs. It attenuates the effects of light pollution and thus increases the contrast between the celestial object being photographed and the background sky.



The broadband filter blocks wavelengths mainly emitted by urban night lighting or undesirable natural light, while allowing the main wavelengths from celestial objects.

The broadband filter blocks Na (sodium) and Hg (mercury) wavelengths mainly emitted by urban night lighting or undesirable natural light (atmospheric oxygen radiation, etc.), while allowing the main wavelengths from celestial objects.

The anti-light pollution filter is particularly useful for improving the brightness of deep sky objects: nebulae, star clusters, galaxies, etc. It is especially effective on emission nebulae because of the filtered wavelengths.

Examples of emission nebulae: Bubble (NGC 7635), Crescent (NGC 6888), Eagle (M16), Elephant’s Trunk (IC 1396), Flame (NGC 2024), Lagoon (M8), North America (NGC 7000), Omega (M17), Orion (M42), Pacman (NGC 281), Rosette (NGC 2237), Tarantula (NGC 2070), Thor’s Helmet (NGC 2359), Trifid (M20), Tulip (Sh2-101).

Designed specifically for the Vespera lens, it fits easily and discreetly into the optical arm. The lens ring that holds the CLS filter is equipped with an electronic card that allows Vespera to detect it.

The filter is delivered in a transparent storage box.

Transmission Curve

Additional information

Enjoy the most dazzling views of nebulae with your Celestron Origin when you add this H-alpha H-beta OIII (Hα-Hβ-OIII) imaging filter. This specialized filter allows high throughput of light wavelengths in emission nebulae while blocking other wavelengths that could diminish image quality and detail. The result is bright, colorful nebulae images that “pop” with detail against the black sky background.

How does the Nebula Filter for Origin work? Emission nebulae primarily emit at discrete wavelengths of light—Hα at 656nm, Hβ at 486nm, and OIII at 496/501nm. By strategically transmitting only these wavelengths of light and blocking the rest of the spectrum, the filter dramatically reduces the effect of light pollution. The “bad” light is blocked while the “good” light associated with emission nebulae passes through to Origin’s sensor.

You’ll immediately notice much higher contrast in your images, especially from your light-polluted backyard! And since the transmission at the critical wavelengths is so high, the nebula will not be dimmed—only the background will be blacker. You’ll also notice some contrast improvement in images of nebulae from darker skies, as the filter serves well in blocking natural skyglow.

Nebula Hunting

The Nebula Filter is perfect for imaging emission nebulae like the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42), the Carina Nebula (NGC 3372), and dozens more. The imaging filter offers maximum light transmission in the key Hα-Hβ-OIII wavelengths, producing high contrast for emission nebulae like these.

The transmission spectrum for the Nebula Filter is 85% or greater at key wavelengths (486nm, 496nm/501nm, 656nm) and less than 0.5% transmission elsewhere. As a narrowband filter, it blocks much of the visible spectrum and only lets these specific wavelengths through. Because of this, you should not use this filter while observing or imaging broadband emission objects, such as galaxies and star clusters. For those objects, you’ll achieve the best results by removing the nebula filter and reinstalling Origin’s clear optical window.

Other similar imaging filters on the market have much narrower bandpasses at the critical Hα-Hβ-OIII wavelengths. Unfortunately, these filters block much of the incoming Hα-Hβ-OIII light for an f/2.2 optical system like Origin’s 6” RASA. This is because a RASA brings light into the filter at a steeper angle, which causes a spectral shift. If you use filters not explicitly designed for use at f/2.2, some of the light from the nebula will be blocked, resulting in a dimmer image. The Nebula Filter for Origin was custom-engineered to work at f/2.2, so none of the “good” light from the nebula is inadvertently blocked by the filter.

Body and Storage

The filter features a machined aluminum black anodized cell with a knurled rim for easy grip during installation. We’ve added anti-reflection coatings to help suppress reflections on the glass. The filter fits directly into the filter drawer in the Celestron Origin’s front lens cell, where the optical window sits. Simply remove the clear window and replace it with the filter. Origin maintains its optical performance across the entire system with the filter installed. No other adapter is needed.

Each filter comes with a foam-lined plastic storage case to safely store the filter or the optical window glass that came with your Celestron Origin when not in use.

Celestron tests every Nebula Filter for Origin individually to verify its performance. Along with your filter, you will receive a spectral transmission graph (like the one pictured above) showing the results of your filter’s test and verifying it performs as expected throughout the spectrum.

Please note this is for the Celestron Origin Intelligent Home Observatory

Specifications:

L-Quad Enhance Filter (L-QEF) is a quad bandpass light pollution suppression filter for colour cameras. It effectively suppresses the transmission of light pollution wavelengths, especially light pollution generated by artificial lighting (including mercury and sodium lamps), as well as the effects of natural skylight-induced effects on the shot, thus effectively enhancing the contrast and details of the celestial bodies, and making the objects more distinct and stereoscopic. This filter provides better color balance while improving resistance of light pollution. L-QEF can be used for both wide field astrophotography, such as the Milky Way in Summer and Winter, and deep sky objects such as nebulae, galaxies, star clusters, and so forth; It allows you to save a lot of time during the shooting process and get better results at the same time. The design of quad bandpass maximises the colour balance of nebulae, galaxies and other broadband spectral targets.

Key Features:

• Cuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast;
• Signal-to-noise ratio (SNR);
• Near IR cut-off to 1000nm, reducing the effects of IR noise;
• L-QEF has more than 90% transmittance of the nebula emission lines at H-Beta/OIII/H-Alpha/SII, with cut-off depth from OD2 to OD4, thus providing a significant increase in resistance to light pollution. L-QEF is good for night sky from Bortel 1 to Bortel 7 levels; (Bortel 8, Bortel 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3nm, 7nm type of filters are available.);
• Suitable for wide range of deep sky targets: it covers most nebulae, galaxies, star clusters, reflected and emitted line signals astronomical objects with higher contrast and rich details while maintaining excellent colour balance. L-QEF is superior to other filters of the same type.

Spectrum and Characteristic

Based on the characteristics of celestial bodies’ emission lines and light pollution emission lines, L-Quad Enhance filter effectively reduces the impact of light pollution and suppresses the background light of astronomical objects, thus effectively enhancing the contrast and details of the celestial bodies. Using L-QEF filter can help you save a lot of time during the shooting process, yet obtaining incredible results.

By selecting very precisely the wavelengths of Hydrogen Alpha (H-alpha) and Oxygen III (O-III), found mainly in nebulae, the filter will increase the contrast between the Stellar object and the sky background. Thus, its use makes it possible to obtain a higher-quality image, with sharper stars and finer details.

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Keep only the essential

The Dual Band filter has been designed to allow only two particular wavelengths to pass through to the Vespera sensor:
– O-III
– H-alpha

Due to the filtered wavelengths, it is particularly effective for photographing nebulae in emission (e.g.: Orion nebula M42, Heart nebula IC 1805 …), dark nebulae endowed with hydrogen (e.g.: Horsehead or Elephant’s Trunk nebula…), planetary nebulae (e.g.: Owl nebula M97, Dumbbell nebula M27…), supernova remnants (e.g.: Veil nebula, Crab Nebula M1…).

For globular clusters (e.g.: Hercules cluster M13, cluster M92…), the selectivity of the Dual Band filter will help you to obtain sharper stars.

A filter specifically studied for Vespera

The optical quality of the Dual Band filter has been specifically studied by our engineers to offer use at full aperture, without any impact on the optical diameter of the instrument. The lens ring is equipped with an electronic micro-card that allows Vespera to detect the Dual Band filter and adapt its observation and image processing parameters.

Transmission curve

The filter features 12nm of bandwidth in each wavelength (O-III = 500.7nm, H-alpha = 656.3nm).

Additional information

Normally available for pickup or shipping approx. 2-3 business days from your order

Light pollution in the night sky can significantly degrade contrast in astronomical images. This is especially true when using very fast telescopes like the 8” RASA because the sky background saturates very quickly. The “noise” of the light pollution overwhelms the “signal” from the celestial object you are imaging, making it difficult to get the most detailed image.

The RASA 8 Light Pollution Filter remedies this by blocking light pollution while transmitting light from deep-sky objects. The result is bright, detailed objects that pop off the black sky background with superior contrast.

Fortunately, many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these wavelengths, the filter greatly reduces the effects of light pollution without degrading overall image quality.

How it Works

The Light Pollution Imaging (LPI) Filter for the 8” RASA blocks light from some of the most common sources of light pollution between 400-700nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapour streetlights, mercury-vapour streetlights, and natural airglow caused by oxygen in the atmosphere.

Unlike some light pollution filters, the LPI filter blocks only specific areas of the spectrum instead of wide regions. This helps to maintain image brightness and colour balance. In addition, specific wavelengths associated with emission nebulae, such as H-α(656nm), H-β (486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects.

The filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window normally mounts. By removing the clear window and replacing it with the filter, optical performance for the entire system is maintained.

Each filter comes with a plastic storage case to safely store the filter or the placeholder glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.

RASA 8 Light Pollution Filter Specifications

RASA 8 Light Pollution Filter Instruction Manual

ZWO Filter Masks 7x36mm are used for fitting unmounted filters to ZWO filter wheels.

Please use the M2 screws and masks to fix the filters:

⚫ Remove the screws securing the back cover and remove the back cover

⚫ Place filters onto the filter positions.

⚫ Use the included M2 screws with masks to secure the filters in place.

⚫ Replace the back cover and tighten the screws.

Drawing of 36mm Masks

The ZWO Methane band (CH4) filter is a special filter for photographical use.

Its FWHM is 20nm which is suitable for most IR sensetive color or mono cameras.It can reveal the detail of the target and not too dark.

It is recommended for planetary imaging such like Jupiter, Saturn and the other planets.

The ZWO LRGB 36mm filter set has better transmission, better coating, better color separation

the RGB color combine weights will be approximately 1:1:1

• Fine-optically polished to ensure accurate 1/4 wavefront
• more than 92% transmission at passband
• Infrared wavelength 700-1100nm cut-off
• Precision off-band blocking
• Multi-layers anti-reflection coating
• Small spectral “gap” to minimize effect of light pollution
• More parfocal – thickness 2mm

Technical Parameter:

Name: ZWO LRGB 36mm filter set (4 filters)

Size: 36mm

Thickness: 2mm

Transmission Curve

ALP-T Dual Band 5nm Filter is best suited for optics f-ratios slower than f/3.6, the standard Antlia ALP-T Dual Band filter is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f/2.2, the highspeed version is the best choice.

The Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual-band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD) 4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.

The Antlia ALP-T Dual Band filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.

Application and Performance:

Designed especially for optics, slower than f/3.6

Engineered specifically for use with DSLR, CMOS, and CCD color cameras

Suppression of optical density (OD) 4.5 on unwanted wavelengths adds signal-to-noise

Extremely steep bandpass edges minimize internal reflections

Ideal flat-top and moderate bandpass reducing spectrum downshifts

Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter

Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8

Near IR (NIR) is blocked up to 1050nm

Technical Specifications:

Filter Ring:

2'' (M48*0.75)

Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture

Black Anodized Finish

Laser Engraving No Fading

Spectrum Curve:

Not Recommended:

Solar imaging

Night visual observation

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER

Serious eye damage will result if you fail to observe the warning

The new ZWO LRGB 2in Filters has good performance in transmission, the high quality coatings offer good colour separation.

Fits the NEW ZWO EFW-5x2 and ZWO-EFW-7x2

Technical Parameter:

Name: ZWO LRGB 2in Filters (4 filters)

Size: 2″

Thickness: 5 mm+2.5mm(thread)

Thread: M48*0.75

Thickness: 1.85mm

the RGB color combine weights will be approximately 1:1:1

• Fine-optically polished to ensure accurate 1/4 wavefront
• more than 92% transmission at passband
• Infrared wavelength 700-1100nm cut-off
• Precision off-band blocking
• Multi-layers anti-reflection coating
• Small spectral “gap” to minimize effect of light pollution
• More parfocal – thickness 1.9+/-0.03 mm

here is the the transmission curve