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Solar Filter in Aluminium Housing for Celestron C9.25-SGT, CPC 925, CGEM 925 PHOTOGRAPHIC

Solar Filter in Aluminium Housing for Celestron C9.25-SGT, CPC 925, CGEM 925 PHOTOGRAPHIC

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0.90 kg
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Solar Filter with Baader AstroSolar Safety Film for Celestron C9.25-SGT, CPC 925, CGEM 925 and similar telescopes in Aluminium housing with fleece inner for better and safer fit

FOR PHOTOGRAPHIC USE with Baader AstroSolar Safety Film ND=3.8
(this version can be used for visual observations ONLY when used together with an appropriate, strong Neutral Density and UV/IR-cut eyepiece filter. For further information click here to see the product description of the Baader AstroSolar Safety Film ND=3.8 )

This version has 10x more transmission than the visual version (lets through 10x more light) and thus allows short exposure times for clearer, crisper images.



These custom made Solar Filters are made with Baader Astro Solar™ Safety Film ND=3.8. Far superior than any existing glass, Mylar or polymer filters, they lead to brighter, sharper, and higher contrast images.


Enter the new millennium with the finest solar filters available. Astro Solar™ Safety Film is clear and homogenous and attains the optical performance of high quality plane-parallel glass filters—it is diffraction limited! Double-sided metal coatings have uniform density and good color balance across the entire field ensuring razor sharp images from edge to edge. The result of interferometer testing of the AstroSolar Safety Film ND=3.8 is 94-96% Strehl ration, which is as good as a lens from Carl Zeiss APQ. Any noticeable difference from much more expensive Baader planoptic glass will be visible only above 250x magnifications.

The Sun appears in its “real ”color —neutral white, not blue or orange, and the sky adjacent to the solar limb is jet black.

You can image detail in sunspots, bright faculae near the limb and the mottled areas known as granules with these filters. The Sun offers constant changes and will keep your observing interesting and fun. Even small aperture telescopes can enjoy features of the Sun.

The Astro Solar™ film is completely safe and durable (won‘t break like glass if dropped). Its rating is ND-3.8 which means that the film transmits 1/8,192 of visible light (.0122%) while reflecting (blocking) 99.988 % of unwanted light. 

Inner diameter with fleece: 270mm   (depending on the thickness of fleece)
(we supply this information in the case you want to use this item with a non-Celestron branded, but similar optical tube. So, if the outer diameter of your telescope's front is the same or similar, please use it but at your own risk.)

Inner diameter without fleece: 277mm
Thickness of aluminium: appr. 1.4mm
Thickness of fleece: 2.5-3.0mm
Clear aperture: 235mm

Please take maximum care when observing the Sun by using this type of solar filter. Check the surface before each observation and do not use it if it is damaged (e.g. punctures). Please make sure that strong wind would not blow away the filter. If necessary, use a cellotape or similar way of securing the filter to the telescope's tube. This is especially important if you have children around who might occasionally kick off the filter by mistake or clumsiness...!
We cannot take responsibility if any of the above occurs; please use it at your own risk!

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