Thread: Solar Filter
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Old 17-03-2015, 06:00 PM
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mental4astro (Alexander)
kids+wife+scopes=happyman

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Join Date: Jun 2008
Location: sydney, australia
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No problem George.

Ken, that little filter I mentioned was several years old, and though in its own box it was knocking about lose in a larger box with other stuff. I don't think it wad looked after gently enough. Anyway, it won't be tempting anyone to use it now. But these solar films are delicate and require 'cotton gloves' care.

George, you won't gain anything with a full aperture 12" solar filter, particularly with visual, and I doubt with photo either. You are viewing typically no more than at 150X, so going beyond 50mm to 100mm is all that you need. The small aperture opening in the lens shade of your scope is plenty to start with. It is also a ready-made opening to use with the solar film without needing to make a new full aperture mask with an off-axis hole. You can explore this avenue down the track. That is the great thing about the Baader Solar Film - you can make several filters from the one sheet.

Edit: good to read Ken's advice on the white light sweet spot.
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