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Baader AstroSolar PHOTO Film 20x30cm, Telescope Qual. ND=3.8

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in In stock (2)
0.15 kg
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including VAT 20.00 % ( £3.60 )


 AstroSolar Photo Film 20x30cm, Telescope Quality, ND = 3.8

This AstroSolar Photo Film ND=3.8 is NOT TO BE USED FOR VISUAL OBSERVATIONS on its own!

This photo film is to be used exclusively for photography of the Sun, when used with a long focal length telescopes via projection eyepiece at high magnification.

When you use this filter and if you have to have a quick look through the telescope (e.g. for checking focus, direction etc.) you MUST always have a UV/IR cut filter (e.g. 2459207A (1.25" version) or 2459210A (2" version)) along with a Neutral Density filter ND=1.8 (e.g. 2458345 (1.25" version) or 2458331 (2" version)) in the beam of light to be installed (or held in front of your eye) for the safety of your eyes!

It is not suitable to be mounted in front of normal camera lenses as the resulting image will be too bright.

(It's possible that better result can be achieved with camera lenses with a front mounted visual ND=5.0 AstroSolar Safety Film or maybe even with some camera lenses with extremely long focal length even with this photographic AstroSolar Safety Film ND=3.8, but we haven't tried it and cannot advise at what focal length to draw the line... we would welcome customer feed back regarding this matter!)

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.


size: 200 x 290mm

optical density: 3.8

Never use any eyepiece filter for solar observation without objective front filter!


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