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

The Antlia 3nm Pro Ultra Narrowband filter set includes the following items:

• Antlia H-Alpha 3nm filter
• Antlia OIII 3nm filter
• Antlia SII 3nm filter

Antlia SHO Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SHO 3nm Pro filter is designed to deliver 88% transmission at the 671.6nm line which provides you with the maximum signal and well defined nebulae structures.

Conventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift. We guarantee T>88% within 1nm range of the center bandwidth,which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.

The out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR(signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths. Improved sharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.

Application and Performance:

• High transmittance and smallest bandwidth to maximize contrast
• Steep spectral profile minimizes halos around bright stars
• A single substrate to eliminate internal reflections
• Narrowband Objects: Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
• Use in light polluted areas and dark sites
• Extends imaging time when the moon is up
• Antlia narrowband Pro filters can be used down to F/3 systems with slight loss of signal
• All Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light
• Superior optical reliability reduces post image processing

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 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.

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 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 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

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 (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 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 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 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