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Model: 8H00IKBrand: Astronomik
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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 useThe 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 usesUsing 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.
SuitabilityVisual observation (dark skies): UnsuitableVisual observation (urban skies): UnsuitableFilm photography: It depends, but very long exposure timesCCD photography: Very good, huge contrast enhancement at S II-emission nebulasDSLR photography (original): UnsuitableDSLR photography (astro modified): Very good, huge contrast enhancement at S II-emission nebulasDSLR photography (MC modified): Very good, huge contrast enhancement at S II-emission nebulasWebcam / Video (Planets): UnsuitableWebcam / Video (Deep Sky): UnsuitableTechnical DataTransmission of over 97% with the SII line (nm)Complete blocking of all disturbing wavelength ranges in the infraredParfocal with other Astronomik filtersGlass thickness: 1mmCompletely resistant against high humidity, scratches and aging effectsDiffraction limited, the filter will not reduce the optical performance of your telescope!Astronomik filters are delivered in a high-quality, long lasting, filter boxSince 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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Astronomik 2" M48 To EOS Clip Filter Adaptor£29.99
A small but very useful adaptor. If you have any Astronomik clip filter, this handy adaptor allows you to use these on any 2" eyepiece using the filter thread on the bottom.
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