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Astronomik SII 12nm CCD EOS Clip Filter

Price:  £179.00 (Inc. 20% VAT)Earn 179 Loyalty Points

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Generally In Stock, Please Confirm Before Ordering

Model:  8H00IK
Brand:  Astronomik

Astronomik SII 12nm CCD EOS Clip Filter
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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
Transmission of over 97% with the SII line (nm)
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

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