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Astronomik SII CCD-Filter 1.25"


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The Astronomik SII-CCD filter, is designed for CCD imaging of gas and planetary nebulae providing maximum gains even in poor conditions.
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The Astronomik SII-CCD filter, is designed for CCD imaging of gas and planetary nebulae. Due to the narrow bandpass of the SII line, the filter provides maximal increase in contrast even under poor observing conditions. The 13 nm bandwidth allows us to achieve transmission as high as 97% -a value that is impossible to reach with filters of narrower bandwidth. With faint supernova remnants and planetary nebulae, the Astronomik SII-CCD filter often makes the difference between detecting the object or not. The filter blocks all unwanted light, especially the Mercury (Hg) and Sodium (Na) emissions from streetlights and the IR region where CCDs are often most sensitive. The optimal focal ratio for the use of this filter is between 1:3.5 and 1:6. The range of application is from 1:2.8 up to 1:15. Unlike other filters of narrower bandpass, loss of transmission with the Astronomik filters does not emerge until focal ratios of 1:2 or faster are used. You can, therefore, image objects within the whole field of view and not only in the middle. This also makes it possible to use the guiding chip of SBIG cameras that otherwise receive almost no light with filters from other companies. Togther with our H-Alpha-CCD filter and the new OIII-CCD filter you can now do tricolor-imaging of emmision line objects even from very heavy light polluted places. Due to the well known high optical quality of the glass substrate, Astronomik SII-CCD filters preserve the pinpoint stars to which you are accustomed from your instruments.

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