Astronomik RGB TYP II

The Astronomik Type II filters  have an integral IR-Blocking coating, thereby removing the need to have a separate permanently-mounted filter.

The standard set comprises R,G,B and a  standard IR-Blocker. For full-spectrum imaging you can use a True Technology clear glass filter (no IR-Block) or an IR-Transmission filter, as this part of  the spectrum is not blocked as would be the case with a permanently mounted IR-Blocker.

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• Astro- optimized transmission curves for images without color-shifts

• each filter blocks the IR, no additional filter necessary

• Correct images for very red as well as for deep blue objects because of reproduction of  a visual characteristic curve

• Transmission of nearly 100%

• Same optical thickness for  all filters

• Resistant  to high humidity, scratches and aging

• Glass substrate of very high quality: You get the sharpest images your scope can deliver 

Astronomik Profi H-Alpha-CCD

The Astronomik H-Alpha-CCD filter is the latest filter in the programme. It is designed for CCD observation of gas nebulas and planetary nebulas. Due to the narrow band pass of the H-Alpha line at 656nm, the filter will give maximum increase in  contrast even under the best observing conditions. Faint supernova remnants and  planetary nebulae the Astronomik H-Alpha filter often makes the difference between  the object being detected or not at all. The filter blocks all unwanted light, especially  Hg and Na emissions from streetlights, and also the IR-region where CCDs are often most senstive.

The best focal ratios for this filter are f/3.5 to f/6. The field of application is from f/2.8 to f/15. Transmission loss that  other filters with smaller bandpasses can suffer, only occurs  with the Astronomik filters at extreme light intensive focal ratios of f/2 and faster. Thus you can image extended objects across the whole field of view and not only in the middle. This advantage permits the use of off-axis auto-guiding chips such as that of   SBIG cameras, which would receive very little  light using  filters from some other manufacturers. The bandwith of 13nm allows us to achieve a transmission as high as 97%. -A value that is impossible to reach with filters having a smaller bandwith.

Due to the  high optical quality of the glass substrate you will still obtain needle-sharp star images using this Astronomik H-Alpha filter.

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• High transmission of nearly 100% at H-Alpha

• FWHM of  ca. 13nm

• total blocking of all unwanted light from light-pollution

•  ideal for  planetary nebulas and supernova remnants

• completely resistant against high humidity and scratches

• highest optical quality on the mark