Astronomik SII 6 nm CCD EOS Clip Filter
More About the Astronomik SII 6 nm EOS Clip Filter
The Astronomik SII 6 nm Canon EOS Clip Filter is an extremely narrow emission-line filter designed for use with Canon EOS DSLR Cameras along with devices as fast as f/3.5 for CCD astro-imaging applications only. Not appropriate for visual or solar operations. Using this filter guarantees 90% transmission or more at SII (671.7nm-673.0nm). This filter is made to Astronomik's exacting standards. While transmission ratings may vary between each filter, you are guaranteed a transmission rating greater than 90%, with a typical transmission rating of around 94% for the 6 nm SII. The specific T-Max will be listed on the filter case. You can rest easy knowing that every unit is thoroughly tested and guaranteed to meet Astronomik's stellar benchmark of performance!
With its smaller 6 nm FWHM, this Astronomik SII CCD EOS Clip Filter is ideal for exhibiting the maximum amount of contrast between objects that emit SII light, such as emission nebulae and the skyglow background. 6 nm filters offer similar performance when compared with 12 nm filters, but also provide a higher contrast gain. On the contrary, using a 6 nm FWHM filter can cause background stars to appear dimmer, or to not be viewable at all. Thus, to achieve maximum contrast without sacrificing the background quality of your final image, it is best to employ both the 6 nm and 12 nm SII filters together.
Since the Astronomik 6 nm SII EOS Clip Filter completely eradicates mercury (Hg) and sodium (Na) emissions lines, the main culprits of light pollution, it makes an excellent filter for imaging in heavily light-polluted environments.
The Astronomik EOS Clip Filter, like all filters from Astronomik, is parfocal with all other Astronomik filters. Additionally, this filter is highly resistant to the effects of scratching, aging, and high humidity. Package includes a durable, supreme quality plastic storage container.
Astronomik Clip-Filter System
This Clip-Filter system, exclusive to Astronomik, is constructed from black anodized aluminum and laser-cut on extremely modern machines. In a matter of mere seconds, this filter can be inserted directly into the Canon EOS camera body. No adjustments are necessary and all lens operations such as focus, screen, and image stabilization, remain operational! All Canon system lenses with the exception of the EF-S series, plus all M42 and T2 lens adapters, work with the Astronomik EOS Clip Filter. This system also doubles as a dust protector, keeping dust from gathering on your sensor during long exposures.
Transmission Specifications
- Usual ionized sulfur (SII) line transmission of 96%
- Provides total obstruction of unwanted light from UV up to IR