Astronomik S-II 6nm Imaging Filter - Canon EOS APS-C Clip Filter
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The Astronomik SII filter is ideal for imaging nebulae showing sulfur emissions from both light-polluted and dark observation sites. It significantly enhances the contrast between objects emitting light at 671.7nm and 673nm (SII lines) and the sky background. The Astronomik SII filter completely filters out the emission lines from high- and low-pressure sodium (Na)- and mercury (Hg)-vapor lamps, as well as all lines of natural airglow and most of the distracting moonlight. For particularly high-contrast results, the Astronomik SII filter is optimised to prevent H-alpha light from passing through.
With a narrow bandwidth of either 12nm or 6nm and high transmission rates, the filter effectively blocks all unwanted light from wavelengths other than 671.7nm and 673nm from ultraviolet (UV) to infrared (IR).
Difference between Astronomik 12nm and 6nm filters
The choice between 12nm and 6nm Full-Width-Half-Maximum (FWHM) filters depends on your imaging conditions and camera type. There is no universal "best" option - each FWHM serves a specific purpose.
The 6nm Astronomik Narrowband-Emissionline filters are ideal for imaging faint objects in star-crowded regions of the milky way, as they typically halve the number of stars in the image compared to the 12nm filter. They are also suitable if you have a camera with very low dark current or if you are observing from a location with extreme light pollution.
Difference between Astronomik MFR and MaxFR coating
Both the Astronomik MFR and MaxFR coatings give you the best out-of-band blocking over the entire wavelength range from UV to IR, extremely high contrast, minimized stray light, no halos and needle-sharp stars.
- 6nm MFR-coated filters can be used in all instruments with aperture ratios from f/4 to f/∞ without significant performance loss.
Clip-Filter for Canon EOS APS-C DSLR cameras
Since 2007, we offer our extremely popular Astronomik Clip-Filters. The complete range of Astronomik filters is available as Clip-Filters for the Canon EOS DSLR cameras with APS-C sensors.
The Astronomik Clip-Filters offer a number of practical advantages that make them an ideal choice for astrophotographers:
- Installing and removing the Astronomik Clip-Filter is very quick and easy and requires no extra tools or modifications to the camera body. They can be changed at any time, even at night.
- All lens functions, such as focus, aperture, and image stabilization remain fully functional.
- The Astronomik Clip-Filters are held securely in place without stressing the high-quality glass.
- The Astronomik Clip-Filters are designed and optimized for use with both standard camera lenses and telescopes.
Through the Astronomik Clip-Filters, we were able to solve several common issues faced by astrophotographers:
- Large filters for large camera lenses are very expensive.
- Using a filter holder between the camera body and the lens prevents focusing to infinity.
- For very fast telescopes (low f-number) like the Vixen R200SS or the Takahashi "Epsilon" astrograph, a filter drawer or filter wheel cannot be used because the distance to the corrector lenses would be changed.
- Long exposure times lead to dust settling on the camera's sensor chip.
The Astronomik EOS APS-C Clip-Filters are made from black anodized aluminum.
Additionally, all Astronomik EOS APS-C Clip-Filters serve as an excellent dust shield, protecting the sensor during long exposures. If you only need a dust shield without filtering effects, the Astronomik MC-Clear EOS APS-C Clip-Filter is the right choice.
Use Astronomik filters for your Canon EOS APS-C DSLR camera and enjoy marvelous images with an ultra light equipment!
Compatible Canon EOS APS-C DSLR cameras
| Model | Compatibility |
|---|---|
| Canon EOS-1D (all variants) | No |
| Canon EOS 5D (all variants) | No |
| Canon EOS 7D | Yes |
| Canon EOS 7D Mark II | Yes |
| Canon EOS 20D | Yes |
| Canon EOS 20Da | Yes |
| Canon EOS 30D | Yes |
| Canon EOS 40D | Yes |
| Canon EOS 50D | Yes |
| Canon EOS 60D | Yes |
| Canon EOS 60Da | Yes |
| Canon EOS 70D | Yes |
| Canon EOS 77D | Yes |
| Canon EOS 80D | Yes |
| Canon EOS 90D | Yes |
| Canon EOS 100D / Rebel SL1 / Kiss X7 | Yes |
| Canon EOS 200D / Rebel SL2 / Kiss X9 | Yes |
| Canon EOS 250D / Rebel SL3 / Kiss X10 | Yes |
| Canon EOS 300D / Digital Rebel / Kiss Digital | Yes |
| Canon EOS 350D / Digital Rebel XT / Kiss Digital N | Yes |
| Canon EOS 400D / Digital Rebel XTi / Kiss Digital X | Yes |
| Canon EOS 450D / Digital Rebel XSi / Kiss X2 | Yes |
| Canon EOS 500D / Digital Rebel T1i / Kiss X3 | Yes |
| Canon EOS 550D / Digital Rebel T2i / Kiss X4 | Yes |
| Canon EOS 600D / Digital Rebel T3i / Kiss X5 | Yes |
| Canon EOS 650D / Digital Rebel T4i / Kiss X6i | Yes |
| Canon EOS 700D / Digital Rebel T5i / Kiss X7i | Yes |
| Canon EOS 750D / Rebel T6i / Kiss X8i | Yes |
| Canon EOS 760D / Rebel T6s / 8000D | Yes |
| Canon EOS 800D / Rebel T7i / Kiss X9i | Yes |
| Canon EOS 850D / Rebel T8i / Kiss X10i | Yes |
| Canon EOS 1000D / Digital Rebel XS / Kiss F | Yes |
| Canon EOS 1100D / Rebel T3 / Kiss X50 | Yes |
| Canon EOS 1200D / Rebel T5 / Kiss X70 | Yes |
| Canon EOS 1300D / Rebel T6 / Kiss X80 | Yes |
| Canon EOS 1500D / 2000D / Rebel T7 / Kiss X90 | Yes |
| Canon EOS 4000D / Rebel T100 / 3000D | Yes |
| Canon cameras offered before 2003 | No |
The Astronomik EOS APS-C Clip-Filters fit into the original Canon EF to EF-M bayonet adapter and can be used with all variants of the Canon EOS M camera.
Compatible lenses and adapters
| Model | Compatibility |
|---|---|
| Original Canon EF-S series lenses | No |
| Lenses from third party manufacturers | Yes |
| M42 lens adapters | Yes |
| T2 lens adapters | Yes |
Technical Data
- Guaranteed transmission of more than 90% at both SII lines (671.7nm and 673.0nm)
- Typical transmission of 93% at both SII lines
- Glass thickness: 1mm
- Finely polished optical glass, free of any striae, residual stresses, and bubbles
- Extremely scratch-resistant and durable coating
- Completely resistant against high humidity and aging effects
- Astronomik MFR coating (Astronomik Deep-Sky RGB, UV-IR Block L-1, L-2, L-3, and Narrowband-Emissionline filters)
- Parfocal with other Astronomik filters
- Diffraction-limited
- Optimized spectral windows
- Delivered in a high-quality, long-lasting filter box
Due to the high-precision machining of the carrier substrate, all Astronomik filters are parfocal with wedge errors far below all common tolerances. Astronomik filters are diffraction-limited, ensuring that the optical performance (resolution and contrast) of your telescope is not compromised. Issues concerning focal distances and the exact alignment of images from each color channel are therefore effectively eliminated.
All Astronomik filters are ideal for modern cameras, including both CMOS- and CCD-based models, ensuring you capture the best possible images with your equipment. Sharpness, contrast, and the absence of any reflections and halos are guaranteed. Even with bright stars in the field of view, nebulae and galaxies will be captured with the finest structures.
Every Astronomik filter undergoes a rigorous quality control process before delivery. Additionally, each Astronomik Narrowband-Emissionline filter is measured using a high-end PerkinElmer Spectrophotometer to ensure it meets the specifications published on our website. On the back of each Narrowband-Emissionline filter box, you will find a label detailing the precise spectral data for that specific filter, including the maximum transmission and the recommended range of focal ratios.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
The Astronomik SII filter is ideal for imaging nebulae showing sulfur emissions from both light-polluted and dark observation sites. It significantly enhances the contrast between objects emitting light at 671.7nm and 673nm (SII lines) and the sky background. The Astronomik SII filter completely filters out the emission lines from high- and low-pressure sodium (Na)- and mercury (Hg)-vapor lamps, as well as all lines of natural airglow and most of the distracting moonlight. For particularly high-contrast results, the Astronomik SII filter is optimised to prevent H-alpha light from passing through.
With a narrow bandwidth of either 12nm or 6nm and high transmission rates, the filter effectively blocks all unwanted light from wavelengths other than 671.7nm and 673nm from ultraviolet (UV) to infrared (IR).
Difference between Astronomik 12nm and 6nm filters
The choice between 12nm and 6nm Full-Width-Half-Maximum (FWHM) filters depends on your imaging conditions and camera type. There is no universal "best" option - each FWHM serves a specific purpose.
The 6nm Astronomik Narrowband-Emissionline filters are ideal for imaging faint objects in star-crowded regions of the milky way, as they typically halve the number of stars in the image compared to the 12nm filter. They are also suitable if you have a camera with very low dark current or if you are observing from a location with extreme light pollution.
Difference between Astronomik MFR and MaxFR coating
Both the Astronomik MFR and MaxFR coatings give you the best out-of-band blocking over the entire wavelength range from UV to IR, extremely high contrast, minimized stray light, no halos and needle-sharp stars.
- 6nm MFR-coated filters can be used in all instruments with aperture ratios from f/4 to f/∞ without significant performance loss.
Clip-Filter for Canon EOS APS-C DSLR cameras
Since 2007, we offer our extremely popular Astronomik Clip-Filters. The complete range of Astronomik filters is available as Clip-Filters for the Canon EOS DSLR cameras with APS-C sensors.
The Astronomik Clip-Filters offer a number of practical advantages that make them an ideal choice for astrophotographers:
- Installing and removing the Astronomik Clip-Filter is very quick and easy and requires no extra tools or modifications to the camera body. They can be changed at any time, even at night.
- All lens functions, such as focus, aperture, and image stabilization remain fully functional.
- The Astronomik Clip-Filters are held securely in place without stressing the high-quality glass.
- The Astronomik Clip-Filters are designed and optimized for use with both standard camera lenses and telescopes.
Through the Astronomik Clip-Filters, we were able to solve several common issues faced by astrophotographers:
- Large filters for large camera lenses are very expensive.
- Using a filter holder between the camera body and the lens prevents focusing to infinity.
- For very fast telescopes (low f-number) like the Vixen R200SS or the Takahashi "Epsilon" astrograph, a filter drawer or filter wheel cannot be used because the distance to the corrector lenses would be changed.
- Long exposure times lead to dust settling on the camera's sensor chip.
The Astronomik EOS APS-C Clip-Filters are made from black anodized aluminum.
Additionally, all Astronomik EOS APS-C Clip-Filters serve as an excellent dust shield, protecting the sensor during long exposures. If you only need a dust shield without filtering effects, the Astronomik MC-Clear EOS APS-C Clip-Filter is the right choice.
Use Astronomik filters for your Canon EOS APS-C DSLR camera and enjoy marvelous images with an ultra light equipment!
Compatible Canon EOS APS-C DSLR cameras
| Model | Compatibility |
|---|---|
| Canon EOS-1D (all variants) | No |
| Canon EOS 5D (all variants) | No |
| Canon EOS 7D | Yes |
| Canon EOS 7D Mark II | Yes |
| Canon EOS 20D | Yes |
| Canon EOS 20Da | Yes |
| Canon EOS 30D | Yes |
| Canon EOS 40D | Yes |
| Canon EOS 50D | Yes |
| Canon EOS 60D | Yes |
| Canon EOS 60Da | Yes |
| Canon EOS 70D | Yes |
| Canon EOS 77D | Yes |
| Canon EOS 80D | Yes |
| Canon EOS 90D | Yes |
| Canon EOS 100D / Rebel SL1 / Kiss X7 | Yes |
| Canon EOS 200D / Rebel SL2 / Kiss X9 | Yes |
| Canon EOS 250D / Rebel SL3 / Kiss X10 | Yes |
| Canon EOS 300D / Digital Rebel / Kiss Digital | Yes |
| Canon EOS 350D / Digital Rebel XT / Kiss Digital N | Yes |
| Canon EOS 400D / Digital Rebel XTi / Kiss Digital X | Yes |
| Canon EOS 450D / Digital Rebel XSi / Kiss X2 | Yes |
| Canon EOS 500D / Digital Rebel T1i / Kiss X3 | Yes |
| Canon EOS 550D / Digital Rebel T2i / Kiss X4 | Yes |
| Canon EOS 600D / Digital Rebel T3i / Kiss X5 | Yes |
| Canon EOS 650D / Digital Rebel T4i / Kiss X6i | Yes |
| Canon EOS 700D / Digital Rebel T5i / Kiss X7i | Yes |
| Canon EOS 750D / Rebel T6i / Kiss X8i | Yes |
| Canon EOS 760D / Rebel T6s / 8000D | Yes |
| Canon EOS 800D / Rebel T7i / Kiss X9i | Yes |
| Canon EOS 850D / Rebel T8i / Kiss X10i | Yes |
| Canon EOS 1000D / Digital Rebel XS / Kiss F | Yes |
| Canon EOS 1100D / Rebel T3 / Kiss X50 | Yes |
| Canon EOS 1200D / Rebel T5 / Kiss X70 | Yes |
| Canon EOS 1300D / Rebel T6 / Kiss X80 | Yes |
| Canon EOS 1500D / 2000D / Rebel T7 / Kiss X90 | Yes |
| Canon EOS 4000D / Rebel T100 / 3000D | Yes |
| Canon cameras offered before 2003 | No |
The Astronomik EOS APS-C Clip-Filters fit into the original Canon EF to EF-M bayonet adapter and can be used with all variants of the Canon EOS M camera.
Compatible lenses and adapters
| Model | Compatibility |
|---|---|
| Original Canon EF-S series lenses | No |
| Lenses from third party manufacturers | Yes |
| M42 lens adapters | Yes |
| T2 lens adapters | Yes |
Technical Data
- Guaranteed transmission of more than 90% at both SII lines (671.7nm and 673.0nm)
- Typical transmission of 93% at both SII lines
- Glass thickness: 1mm
- Finely polished optical glass, free of any striae, residual stresses, and bubbles
- Extremely scratch-resistant and durable coating
- Completely resistant against high humidity and aging effects
- Astronomik MFR coating (Astronomik Deep-Sky RGB, UV-IR Block L-1, L-2, L-3, and Narrowband-Emissionline filters)
- Parfocal with other Astronomik filters
- Diffraction-limited
- Optimized spectral windows
- Delivered in a high-quality, long-lasting filter box
Due to the high-precision machining of the carrier substrate, all Astronomik filters are parfocal with wedge errors far below all common tolerances. Astronomik filters are diffraction-limited, ensuring that the optical performance (resolution and contrast) of your telescope is not compromised. Issues concerning focal distances and the exact alignment of images from each color channel are therefore effectively eliminated.
All Astronomik filters are ideal for modern cameras, including both CMOS- and CCD-based models, ensuring you capture the best possible images with your equipment. Sharpness, contrast, and the absence of any reflections and halos are guaranteed. Even with bright stars in the field of view, nebulae and galaxies will be captured with the finest structures.
Every Astronomik filter undergoes a rigorous quality control process before delivery. Additionally, each Astronomik Narrowband-Emissionline filter is measured using a high-end PerkinElmer Spectrophotometer to ensure it meets the specifications published on our website. On the back of each Narrowband-Emissionline filter box, you will find a label detailing the precise spectral data for that specific filter, including the maximum transmission and the recommended range of focal ratios.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Astronomik S-II 6nm Imaging Filter - Canon EOS APS-C Clip Filter