The Chroma Technology Red Filter is a high-performance astrophotography filter designed to capture precise red wavelengths with exceptional clarity. Engineered for use with monochrome CCD and CMOS cameras, this filter enhances image contrast and detail, making it an essential component for LRGB imaging.

Key Features:

• High Transmission Efficiency: Optimized for maximum red light throughput while minimizing signal loss.
• Superior Optical Precision: Minimizes wavefront distortion for sharp, high-contrast images.
• Advanced Anti-Reflection Coatings: Reduces halos and reflections for cleaner astrophotographs.
• Infrared (IR) Blocking: Effectively eliminates unwanted IR contamination, ensuring accurate color reproduction.
• Durable & Reliable: Hard-coated for long-lasting performance in demanding astrophotography conditions.

Designed for professional and amateur astronomers alike, the Chroma Technology Red Filter ensures stunning, true-to-life color balance and detail in your deep-sky imaging projects.

The Astronomik CLS is a budget filter for visual observation, Black & White photography and CCD photographs of nebulae, galaxies and star clusters with astronomical instruments of any size. 

The Astronomik CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.

Main use

The filters are optimized for use with aperture ratios from 1:3 to 1:15. Transmission losses and chromatic distortions, which are problems with other filters, only appear with Astronomik filters when extremely bright aperture ratios of 1:2 and more are used. The CLS filter is suitable for use with telescopes of all aperture sizes.

Suitability

• Visual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)
• Visual observation (urban skies): Good, an UHC-E or UHC filter is more suitable
• Film photography: Very good, colour balance is near perfect
• 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): Very good, if light pollution is a big problem

Technical Data

• 92% transmission at 486nm (H-beta)
• 92% transmission at 496nm (OIII)
• 92% transmission at 501nm (OIII)
• 97% transmission at 656nm (H alpha)
• pass from 450 to 540nm and beyond 650nm
• 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

Ideal filters for the reception of the moon and planets, notably Mars, with telescopes from 6" (150mm) aperture.

The ProPlanet IR 742 only allows infrared light with wavelengths of more than 742 nm to pass. In this wavelength range the effects of seeing are significantly lower than in the visible spectrum of the human eye. This allows much sharper images than are usually obtained from your device and location. Another advantage is that the sky background of advanced dawn is dark and so the filter even allows photography of the planets and the moon at daylight.

Main use

The Astronomik ProPlanet IR 742 cuts off the visible part of the spectrum and allows the light of wavelengths longer then 742nm to pass. Due to this behavior the part of the spectrum that is most sensitive to bad seeing is rejected. This approach does a big improvement to the imaging of planets and the moon. The image is more steady than the image in the visible light with nearly identical exposure times.

Jupiter, imaged with L-RGB Filtern (left) and Astronomik ProPlanet 742 (right)

Comparing sharpness in IR-R-G-B at Saturn

Comparing L-RGB versus IR-RGB at Saturn

Other uses

• Besides astrophotography the filter allows you to get stunning results in nature photography. If an EOS-Clip Filter is used in an MC modified DSLR you get tremendous results imaging the flora. The filter cuts off the part of the spectrum where Chlorophyll looks green and shows its high reflectivety in the near infrared. If trees are photographed in spring and summer under blue skies you get stunning images with white trees and clouds in front of a near black background.
• Darkens the background during twilight.
• Imaging of bright planets, stars and comets by day.
• Imaging of young stars in dust clouds and stellar nurseries.

Alternatives

When the seeing is very bad and the instrument is 10" (250 mm) or larger, the Astronomik ProPlanet IR 807 may be the better choice.

Ideal addition to the Astronomik ProPlanet IR 742 for imaging the moon and planets, with telescopes larger then 10" (250mm) when the seeing is poor.

This filter is an ideal complement to the ProPlanet IR 742 for use with converted DSLR cameras, CCD cameras and Webcams. The effects of seeing are distinctly reduced. It is your entry into previously unknown dimensions of photography of the moon and the planets.

The ProPlanet IR 807 only allows infrared light with wavelengths of more than 807 nm to pass. In this wavelength range the effects of seeing are significantly lower than in the visible spectrum of the human eye. This allows much sharper images than are usually obtained from your device and location. Another advantage is that the sky background of advanced dawn is dark and even allows photography of planets and moon at daylight.

Main use

The Astronomik ProPlanet IR 807 cuts off the visible part of the spectrum and allows the light of wavelengths longer then 807nm to pass. Due to this behavior the part of the spectrum that is most sensitive to bad seeing is rejected. This approach does a big improvement to the imaging of planets and the moon. The image is more steady than the image in the visible light.

Other uses

• The Astronomik ProPlanet IR 807 is designed to be an addition to the Astronomik ProPlanet IR 742, if the seeing is extremely bad and a larger telescope is used.
• For most cameras the exposure times doubles, compared to the Astronomik ProPlanet IR 742 or imaging in visible light, if the Astronomik ProPlanet IR 807 is used.
• Darkens the background during twilight.
• Imaging of bright planets, stars and comets by day.
• Imaging of young stars in dust clouds and stellar nurseries.

Alternatives

If the seeing is not so bad or if the telescope is smaller than 10" (250mm) we recommend the use of the Astronomik ProPlanet IR 742.

Suitability

• Visual observation (dark skies): Unsuitable, the eye is insensitive at this spectrum
• Visual observation (urban skies): Unsuitable, the eye is insensitive at this spectrum
• Film photography: Unsuitable
• CCD photography: Reasonable, for special IR photography (as chlorophyll)
• DSLR photography (original): Unsuitable
• DSLR photography (astro modified): Unsuitable
• DSLR photography (MC modified): Good, for IR daylight photography, longer exposure time
• Webcam / Video (Planets): Very good, rejects problems with seeing, particularly with telescopes larger 250 mm aperture
• Webcam / Video (Deep Sky): Very good, rejects problems with seeing, particularly with telescopes larger 250 mm aperture

Technical Data

• more then 97% transmission for wavelengths of 807nm to 1100nm
• blocking of wavelengths between 350nm and 790nm
• 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

All  Astronomik Filters are perfect for modern cameras, including both CMOS and CCD based cameras, allowing you to capture the very best images possible with your instruments. Sharpness, contrast and the absence of any reflections is guaranteed.

Each and every Astronomik filter has to pass a complex quality control process before being suitable for delivery to our customers. Each and every emission line filter is measured with a high-end Perkin-Elmer spectral-photometer to make sure that every single filter is up to the specifications published on our website.

On the back of each filter-box you will find a label that details the precise sensitivity and band pass measurements for that individual filter inside the box: You will see the max transmission and the recommended range of focal ratio were the filter will give you the best performance.

Thus Astronomik OIII CCD filter is a narrow band emission-line-filter for CCD photography. The filter lets the light of double ionized Oxygen 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 12 nm is optimal suitable for common CCD cameras and allows the use of very fast optics The optimal aperture ratio for the use of the filter is 1:3 to 1:15 with apertures of more than 6" (150mm). It should be noted that the filter has a transmission of up to 99%, which cannot be attained by stacking more narrow-band filters. A further note, which led to selecting the half width (FWHM), is the dark current of common CCD imagers. Exposures with a CCD cooled to -15°C are limited by the dark current of the CCD, even in large cities with a bright background.

Another advantage of the 12 nm filter is the better availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our H-alpha 6nm filter you often won’t find a usable guidestar.

Together with our other three Astronomik emission-line filters you can do great color images even from very light polluted places!

Main use

The Astronomik OIII CCD increases the contrast between objects, in this case between the OIII emission line and the skyglow background. Our Astronomik OIII CCD completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow. 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. The filter has a built-in IR-blocker up to 1150nm. You don’t need an additional IR-blocker with this filter.

Other uses

• When using the Astronomik OIII CCD filter togther with the H-alpha, 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 one single color image.
• If you plan to create color images from emission line data, our CLS CCD filter is a great choice for the Luminance channel
• The OIII CCD is also great for visual observation. If you plan to get filters for visual observation and for astrophotography get the CCD filter: You may use this filter visual as well as in front of you camera. The built-in IR-blocker doesn’t disturb visual observation but you need an additional IR-blocker if you want to use the visual filter with your camera.

Suitability

• Visual observation (dark skies): Very good, huge contrast enhancement at O III-emission nebulas
• Visual observation (urban skies): Very good, huge contrast enhancement at O III-emission nebulas
• Film photography: It depends, very long exposure time
• CCD photography: Very good, huge contrast enhancement at O III-emission nebulas
• DSLR photography (original): Very good, huge contrast enhancement at O III-emission nebulas
• DSLR photography (astro modified): Very good, huge contrast enhancement at O III-emission nebulas
• DSLR photography (MC modified): Very good, huge contrast enhancement at O III-emission nebulas
• Webcam / Video (Planets): Unsuitable
• Webcam / Video (Deep Sky): Reasonable, if light pollution is a big problem and OIII Objects are beeing observed

Technical Data

• typ. 95% transmission at 496nm (OIII)
• typ. 95% transmission at 501nm (OIII)
• full width at half maximum 12nm
• transmission from 494nm to 506nm
• 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 UHC-E Filter increases contrast of emission nebulae and comets and blocks the light of typical streetlights as well as airglow. It is best suited for telescopes up to 5" / 125mm.

Main use

The Astronomik UHC-E filter provides a FWHM of 45nm and blocks the light of typical streetlights (e.g. sodium and mercury vapour) as well as airglow. Thus it increases contrast between your target and the night sky. The contrast enhancement is less than that of the Astronomik UHC filter, but at the same time the transmitted amount of starlight is greater. It's therefore better suited to smaller telescopes. As the UHC-E filter passes a spectral line of Carbon (due to the higher FWHM) it opens up the possibility of comet observation.

Other uses

• Observation of Jupiter’s clouds.
• Easier resolution of Double Stars.
• Photography under light-polluted skies with DSLRs and other cameras.

Suitability

• Visual observation (dark skies): Reasonable, an UHC filter is more suitable
• Visual observation (urban skies): Good, for telescopes up to 125 mm aperture and medium exit pupil
• Film photography: Good, but very long exposure times
• CCD photography: Good, when used with an additional IR-block-filter
• DSLR photography (original): Good, colour balance is near perfect
• DSLR photography (astro modified): 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): Very good, if light pollution is a big problem

Technical Data

• typ. 94% transmission at 486nm (H-beta)
• typ. 95% transmission at 496nm (OIII)
• typ. 95% transmission at 501nm (OIII)
• typ. 94% transmission at 656nm (H alpha)
• transmission 465nm to 530nm and above 645nm 
• Full width at half maximum 45nm
• 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 Chroma Technology U-Bessell Filter is a high-precision astronomical filter designed to meet the rigorous requirements of photometric observations and astrophotography. It adheres to the Bessell photometric system's specifications, isolating the ultraviolet (U) band for capturing accurate data in scientific studies and delivering stunning images of celestial objects.

This filter is crafted with premium materials and advanced multi-layer dielectric coatings, ensuring exceptional transmission in the U-band while minimizing unwanted light from adjacent bands. Its precise spectral profile makes it ideal for measuring the ultraviolet emission from stars, galaxies, and other astronomical objects, enabling astrophotographers and researchers to gather accurate color and intensity data.

Durable and reliable, the Chroma U-Bessell Filter resists environmental degradation and delivers consistent performance under various imaging conditions. Whether you're conducting photometric studies or enhancing your imaging setup, this filter is an indispensable tool for achieving accurate and high-quality results in ultraviolet astronomy.

The Chroma Technology B-Bessell Filter is a precision-engineered astronomical filter tailored for photometric applications and astrophotography. Designed to meet the standards of the Bessell photometric system, this filter isolates the blue (B) band, ensuring accurate and reliable data collection for scientific observations and vivid imaging of celestial objects.

With advanced multi-layer dielectric coatings, the B-Bessell filter offers exceptional transmission in the blue band while effectively suppressing out-of-band light. This makes it ideal for capturing the true colors and intensities of stars, galaxies, and other deep-sky objects, ensuring high-fidelity photometric measurements and visually stunning results.

Built for durability and consistent performance, the Chroma B-Bessell Filter is resistant to environmental wear and designed to perform under a range of imaging conditions. Whether you're conducting precise photometric studies or enhancing your astrophotography, this filter is an essential tool for achieving accurate and high-quality results in the blue spectrum.

The Chroma Technology R-Bessell Filter is a precision-crafted astronomical filter designed for photometric research and astrophotography. Built to meet the stringent standards of the Bessell photometric system, this filter isolates the red (R) band, providing accurate data for scientific observations and vivid imagery of celestial objects.

Featuring advanced multi-layer dielectric coatings, the R-Bessell filter offers exceptional transmission in the red spectrum while minimizing out-of-band interference. It is ideal for capturing the rich hues and intensities of stars, nebulae, and galaxies, ensuring reliable photometric measurements and breathtaking astrophotographic results.

Engineered for durability and consistent performance, the Chroma R-Bessell Filter resists environmental wear, maintaining its precision across diverse imaging conditions. Whether used for detailed photometric analysis or enhancing your astrophotography workflow, this filter is an indispensable tool for delivering accurate and high-quality results in the red band.

The Chroma Technology V-Bessell Filter is a high-precision astronomical filter specifically designed for photometric studies and astrophotography. Adhering to the Bessell photometric system's specifications, this filter isolates the visual (V) band, enabling accurate measurements and stunning visual representations of celestial objects.

Engineered with advanced multi-layer dielectric coatings, the V-Bessell filter ensures optimal transmission in the visual spectrum while effectively blocking out-of-band light. It is particularly suited for capturing the true brightness and color of stars, galaxies, and other astronomical phenomena, making it a valuable tool for both scientific research and astrophotographic imaging.

Crafted for reliability and durability, the Chroma V-Bessell Filter withstands environmental challenges and delivers consistent performance across various observing conditions. Whether you're conducting detailed photometric analyses or enhancing your imaging setup, this filter provides exceptional accuracy and clarity in the visual band, making it an essential component for professionals and enthusiasts alike.

The 5nm Chroma H-alpha Filter strikes the perfect balance between precision and versatility for astrophotography. With its 5nm bandwidth centered on the H-alpha emission line at 656.3nm, this filter provides exceptional contrast and detail while maintaining a wider passband for increased light throughput, making it ideal for capturing faint nebulosity in less-than-perfect conditions.

Crafted with superior optical coatings and premium materials, the Chroma 5nm filter minimizes reflections and halos, ensuring sharp, high-quality images. It is optimized for fast optical systems and performs brilliantly under both light-polluted and dark skies. Durable and weather-resistant, this filter is built to withstand the rigors of frequent use in any imaging environment.

Whether you're an advanced astrophotographer or just stepping into narrowband imaging, the 5nm Chroma H-alpha Filter offers the perfect combination of clarity, performance, and flexibility to bring your deep-sky images to life.

The Chroma Technology I-Bessell Filter is a premium astronomical filter designed for photometric precision and advanced astrophotography. Aligned with the Bessell photometric system, this filter isolates the infrared (I) band, enabling accurate data collection and enhanced imaging of celestial objects in the near-infrared spectrum.

Utilizing advanced multi-layer dielectric coatings, the I-Bessell filter ensures exceptional transmission in the I band while effectively reducing out-of-band interference. It is ideal for capturing the subtle details and intensities of stars, galaxies, and other deep-sky objects, particularly in the near-infrared region, where many astronomical features become more prominent.

Durable and reliable, the Chroma I-Bessell Filter is designed to withstand challenging imaging environments while delivering consistent performance. Whether you're conducting precise photometric studies or capturing striking astrophotographic images, this filter is an essential tool for professionals and enthusiasts seeking accuracy and excellence in the near-infrared spectrum.

The Chroma Technology U-Sloan SDSS Filter is a high-performance astronomical filter engineered for precise photometric measurements and advanced imaging applications. Designed to align with the Sloan Digital Sky Survey (SDSS) photometric system, this filter isolates the ultraviolet (U) band, ensuring accurate and reliable data for scientific studies and astrophotography.

Constructed with advanced multi-layer dielectric coatings, the U-Sloan filter offers superior transmission in the ultraviolet range while minimizing out-of-band interference. It is ideal for capturing ultraviolet emissions from stars, galaxies, and other celestial phenomena, enabling detailed studies of astrophysical properties and producing visually striking imagery.

Built for durability and consistent performance, the Chroma U-Sloan SDSS Filter resists environmental degradation, maintaining its precision under diverse observing conditions. Whether used for professional research or enhancing your astrophotographic capabilities, this filter delivers exceptional accuracy and clarity in the ultraviolet spectrum, making it an indispensable tool for astronomers and astrophotographers alike.

The Chroma Technology I-Sloan SDSS Filter is a high-precision astronomical filter tailored for photometric accuracy and advanced imaging. Designed in accordance with the Sloan Digital Sky Survey (SDSS) photometric system, this filter isolates the near-infrared (I) band, enabling detailed observations and vivid imaging of celestial objects in this spectrum.

Crafted with advanced multi-layer dielectric coatings, the I-Sloan filter ensures exceptional transmission in the I band while effectively blocking unwanted light from adjacent bands. It is particularly suited for capturing the subtle details of stars, galaxies, and other deep-sky objects in the near-infrared, where unique astrophysical phenomena can be observed.

Built to withstand rigorous use, the Chroma I-Sloan SDSS Filter offers durability and consistent performance across diverse imaging conditions. Whether used for precise photometric studies or astrophotographic projects, this filter provides unparalleled clarity and accuracy in the near-infrared spectrum, making it an essential tool for astronomers and astrophotographers striving for superior results.

The Chroma Technology Z-Sloan SDSS Filter is a precision-designed astronomical filter tailored for photometric accuracy and advanced astrophotography. Conforming to the Sloan Digital Sky Survey (SDSS) photometric system, this filter isolates the z band, a region in the far-red to near-infrared spectrum, ensuring precise data collection and exceptional imaging performance.

With advanced multi-layer dielectric coatings, the Z-Sloan filter offers outstanding transmission in the z band, which typically spans wavelengths from approximately 850 nm to 950 nm, while effectively minimizing light from adjacent bands. It is particularly useful for observing cooler stars, distant galaxies, and objects obscured by interstellar dust, as the z band penetrates these regions more effectively than shorter wavelengths.

Engineered for durability and consistent performance, the Chroma Z-Sloan SDSS Filter maintains its precision under challenging imaging conditions. Whether used for detailed photometric studies or capturing stunning astrophotographic images, this filter provides exceptional clarity and accuracy in the far-red to near-infrared spectrum, making it an indispensable tool for astronomers and astrophotographers seeking superior results.

Optolong LRGB filter set is designed for maximum contrast and with extremely high gradients for clear differentiation of colors. The LRGB filter set divides the spectrum into its components red, green, blue and luminance.

OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. Gap between green and red filters serves to block out the primary Sodium light pollution line at 589nm and improves color balance and separation.

• RGB, parfocal:1:1:1
• Creat images in their true original colors showing a wealth of natural detail;
• Steep bandpass filters to eliminate UV and IR interference;
• Include Luminance (UV/IR Cut), Red, Green, and Blue filters to reproduce the star's color
  
  

The Astronomik SII-CCD filter is a narrow-band-filter for CCD photography.The filter lets the light of the ionized sulfur (SII) pass, and blocks nearly the whole remainder of the visual spectrum as well as IR, in which the CCD is sensitive.

The full width at half maximum (FWHM) of 12nm is optimal suitable for common CCD cameras and allows the use of very fast optics. 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. It should be noted, that the filter has a transmission of up to 99%.

Another advantage of the 12nm filters is the good 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 Astronomik SII CCD filter increases the contrast between objects, in this case between those with SII emission lines and the skyglow background. Also, our Astronomik SII-CCD filter completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow.

Main use

The Astronomik SII CCD increases the contrast between objects, in this case between the SII emission line and the skyglow background. Our Astronomik SII CCD completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow. Due to the high optical quality of the Astronomik H-alpha-CCD substrate you will see the same needle-sharp stars as you would from your regular telescope.

Other uses

• Using the new H-alpha-CCD and the new 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 one single color image.
• 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: It depends, but very long exposure times
• CCD photography: Very good, huge contrast enhancement at S II-emission nebulas
• DSLR photography (original): Unsuitable
• DSLR photography (astro modified): Very good, huge contrast enhancement at S II-emission nebulas
• DSLR photography (MC modified): Very good, huge contrast enhancement at S II-emission nebulas
• Webcam / Video (Planets): Unsuitable
• Webcam / Video (Deep Sky): Unsuitable

Technical Data

• typ. transmission of 95% at both SII lines (671,7nm und 673,0nm)
• Complete blocking of all disturbing wavelength ranges 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

The 8nm Chroma H-alpha Filter is a high-performance narrowband filter designed for astrophotography enthusiasts and professionals. With a precise 8nm bandwidth, this filter isolates the H-alpha emission line at 656.3nm, allowing you to capture stunning details in nebulae and other deep-sky objects with remarkable contrast and clarity.

Manufactured with exceptional optical quality, the Chroma H-alpha filter minimizes halos and reflections, ensuring sharp and artifact-free images even with fast optical systems. Its durable construction features an anti-reflective coating and resistance to environmental conditions, making it an ideal choice for both remote observatories and portable setups. Whether you're imaging under light-polluted skies or pristine dark skies, the Chroma H-alpha filter elevates your astrophotography to the next level.

The 3nm Chroma H-BETA Filter is a premium astrophotography tool designed for capturing breathtaking details in hydrogen-beta emission nebulae. With a precise 3nm bandwidth, this filter isolates the H-Beta spectral line (486.1nm), enhancing contrast and revealing subtle features in faint nebulae like the Horsehead Nebula and the California Nebula.

Engineered with superior optical coatings, the Chroma H-BETA filter offers exceptional transmission, ensuring maximum light throughput while effectively blocking unwanted wavelengths such as light pollution and moonlight. Its advanced construction guarantees durability, scratch resistance, and unparalleled performance across a wide range of imaging systems.

Whether you're imaging with a DSLR, CCD, or CMOS camera, the 3nm Chroma H-BETA filter is the perfect choice for astrophotographers seeking to unlock new levels of detail in their deep-sky images. Experience the universe with clarity and precision, as only Chroma can deliver.

The 5nm Chroma H-BETA Filter is a high-performance astrophotography tool crafted to capture stunning details in hydrogen-beta emission nebulae. With its precise 5nm bandwidth, this filter isolates the H-Beta spectral line (486.1nm), boosting contrast and revealing intricate structures in faint nebulae like the Horsehead Nebula and the California Nebula.

Built with premium optical coatings, the Chroma H-BETA filter ensures excellent transmission, maximizing light throughput while effectively blocking unwanted wavelengths such as light pollution and moonlight. Its robust design provides exceptional durability, scratch resistance, and consistent performance across a variety of imaging systems.

Whether you’re using a DSLR, CCD, or CMOS camera, the 5nm Chroma H-BETA filter is an ideal choice for astrophotographers aiming to enhance the depth and detail in their deep-sky images. Discover the cosmos with clarity and precision, as only Chroma can provide.

The CHROMA TECHNOLOGY OIII (8nm) Filter is a versatile narrowband filter crafted for astrophotography and scientific imaging. Designed to isolate the Oxygen III (OIII) emission line at 500.7nm with an 8nm bandwidth, this filter provides excellent contrast while allowing more light throughput. It’s ideal for capturing stunning deep-sky images, particularly of nebulae, even in light-polluted or moonlit conditions.

Featuring advanced multi-layer dielectric coatings, the CHROMA OIII filter ensures outstanding performance and durability. Its design minimizes halos and reflections while maintaining superior transmission, making it a reliable choice for astrophotographers of all levels, whether working in urban skies or dark-sky locations.

The CHROMA TECHNOLOGY OIII (5nm) Filter is a premium narrowband filter designed for astrophotography and scientific imaging, offering a balanced combination of contrast and light throughput. This filter targets the Oxygen III (OIII) emission line at 500.7nm with a precise 5nm bandwidth, effectively reducing light pollution, moonlight, and other unwanted wavelengths. It provides enhanced contrast and detail, making it ideal for capturing faint nebular structures and intricate deep-sky details.

Built with advanced multi-layer dielectric coatings, the CHROMA OIII filter ensures high transmission and long-lasting performance. Its robust design and rigorous quality control make it an excellent choice for both professional and amateur astrophotographers, delivering stunning high-contrast images with minimal halos or reflections.

The Chroma Technology 5nm 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 a narrow 5nm bandwidth, offering excellent contrast and detail for capturing deep-sky objects, especially emission nebulae.

Crafted with precision, this filter incorporates advanced multi-layer dielectric coatings for outstanding light transmission and durability. Its 5nm design effectively minimizes light pollution and moonlight interference, making it suitable for imaging under a variety of conditions. Whether you're capturing images in urban settings or beneath dark skies, the Chroma 5nm SII filter delivers sharp, halo-free results with minimal reflections, making it a must-have for astrophotographers seeking stunning and detailed imagery.

The Chroma Technology 8nm 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 8nm bandwidth, offering excellent contrast and detail for capturing deep-sky objects, especially emission nebulae.

Crafted with precision, this filter incorporates advanced multi-layer dielectric coatings for outstanding light transmission and durability. Its 8nm design balances light collection and selectivity, effectively reducing light pollution and moonlight interference while allowing more signal for fainter objects. Whether you're imaging in urban environments or under pristine dark skies, the Chroma 8nm SII filter delivers sharp, halo-free results with minimal reflections, making it an essential tool for astrophotographers striving for stunning and detailed imagery.

The Chroma Technology R-Sloan SDSS Filter is a precision-engineered astronomical filter designed for photometric studies and astrophotography. Conforming to the Sloan Digital Sky Survey (SDSS) photometric system, this filter isolates the red (R) band, ensuring accurate measurements and stunning imaging of celestial objects in the red spectrum.

Featuring advanced multi-layer dielectric coatings, the R-Sloan filter delivers exceptional transmission in the red band while minimizing out-of-band interference. It is ideal for capturing the richness and detail of stars, galaxies, and nebulae, particularly those with significant red emission features, making it an essential tool for both scientific observations and high-quality astrophotography.

Durable and reliable, the Chroma R-Sloan SDSS Filter is designed to withstand challenging imaging environments while maintaining precise performance. Whether you're conducting detailed photometric analyses or creating vivid astrophotographic images, this filter provides outstanding accuracy and clarity in the red band, making it indispensable for astronomers and astrophotographers seeking superior results.

The Astronomik 6nm H-alpha filter is an extremely narrow emission-line 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 6nm is optimized for a maximum contrast between the (H-alpha emitting) object and the background. The contrast gain is much higher than with our 12nm emission line filters but you won’t see as much stars in the resulting images.

The design of the transmission curve makes it possible to use the filters with instruments from 1:3.75 to 1:15. Selected filters for faster system are available upon special request.

All transmission curves of the 6nm filter are measured individually. Because of this procedure you can get the optimum filter for your telescope: If you place a direct order please specify the focal ratio of your instrument and we will select the best filter for your setup. So you may get the best filter without paying for an A+ filter.

Main use

The Astronomik H-alpha-CCD (6nm version) increases the contrast between objects, in this case between the H-alpha emission line and the skyglow background in the same way as the 12nm version. The gain in contrast is much higher due to the smaller FWHM. The 6nm H-Alpha filter is the right choice for extremely dim objects, even in the milkyway, and for observations from heavily light-polluted places. The Astronomik 6nm H-alpha-CCD completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios come into play. Selected filters for faster systems are available upon special request.

Other uses

• Using the Astronomik 6nm H-Alpha together with the 12nm H-Alpha gives you the ability to have a maximum contrast in the HII objects and to keep the stars in the final image.
• The Astronomik 6nm H-Alpha filter may NOT be used for solar observation.

Suitability

• Visual observation (dark skies): Unsuitable
• Visual observation (urban skies): Unsuitable
• Film photography: Unsuitable
• 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): Unsuitable

Technical Data

• typ. transmission von über 90% at H-Alpha (656nm)
• 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