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Astronomik OIII 12 nm CCD Filter - EOS Clip - OIIICCD-EOS

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SKU: ASF-OIIICCD-EOS

Astronomik OIII 12 nm CCD Canon EOS Clip Filter


  • With a Canon EOS Clip format, the Astronomik OIII CCD Clip Filter is made for standard Canon EOS cameras which have an IR blocking filter over their detector

  • The Astronomik OIII 12 nm CCD Filter - EOS Clip is made for astrophotography

  • This filter has a Transmission of nearly 100% in the OIII line

  • FWHM bandwidth of roughly 12 nm

  • The ideal filter for imaging planetary nebulae and supernova remnants

  • Coatings offer exceptional protection against scratching, aging, and humidity

  • Diffraction limited, the filter will not reduce the optical performance of your telescope

  • Best-suited for telescopes with an aperture of at least 6" (152 mm)

  • Made in Germany, a country renowned for their optical quality!


More About the Astronomik OIII 12 nm CCD Filter - EOS Clip


The 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 ideal 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" (150 mm). 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 built-in-autoguider.

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 1150 nm. You don’t need an additional IR-blocker with this filter.

When using the Astronomik OIII 12 nm CCD - EOS Clip filter together with the H-alpha, 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. Diffraction limited, the filter will not reduce the optical performance of your telescope! Astronomik filters are delivered in a high-quality, long lasting, plastic filter box.

Astronomik EOS Clip Filter System

Made from black anodized aluminum and laser-cut on state-of-the-art machines, Astronomik's unique Clip-Filter system can be placed directly into the camera body of the Canon EOS in only seconds. Adjustments are not needed, and all lens functions such as focus, screen, and image stabilization, stay operational! Excluding the EF-S series, all Canon system lenses, as well as all M42 and T2 lens adapters, are compatible with the Astronomik EOS Clip Filter. This system also serves as a suitable dust shield, preventing dust from gathering on your sensor when taking long exposures.

Transmission Specifications


  • 99%+ transmission for both of the OIII lines

  • Blocks unwanted wavelengths in other parts of the visible spectrum



List of Compatible Canon EOS Cameras

Canon EOS
 Suitable for Clip-Filter? 
 LiveView? 
7D MkII
Yes
Yes
7D
Yes
Yes
20D
Yes
No
20Da
Yes
Yes
30D
Yes
No
40D
Yes
Yes
50D
Yes
Yes
60D + 60Da
Yes
Yes
70D
Yes
Yes
77D
Yes
Yes
80D
Yes
Yes
300D / Digital Rebel / Kiss Digital
Yes
No
 350D / Digital Rebel XT / Kiss Digital N 
Yes
No
 400D / Digital Rebel XTi / Kiss Digital X 
Yes
No
450D / Rebel XSi / Kiss X2
Yes
Yes
500D / Rebel T1i / Kiss X3
Yes
Yes
550D / Rebel T2i / Kiss X4
Yes
Yes
600D / Rebel T3i / Kiss X5
Yes
Yes
650D / Rebel T4i / Kiss X6
Yes
Yes
700D / Rebel T5i / Kiss X7
Yes
Yes
750D / Rebel T6i / Kiss X8
Yes
Yes
760D / Rebel T7i / Kiss X9
Yes
Yes
1000D / Rebel XS / Kiss F
Yes
Yes
1100D / Rebel T3 / Kiss X50
Yes
Yes
1200D
Yes
Yes
1300D
Yes
Yes
2000D
Yes
Yes
100D
Yes
Yes
200D
Yes
Yes