Baader AstroSolar Filter Film OD 5.0 is one of those “secret” astronomy products that looks almost too simple to be special. In its most familiar form, it’s a thin, silvery A3 or A4 sheet of metalized film that can be cut and mounted in cardboard, plastic or commercial filter cells. Surely it’s better to have a pre-made filter for your camera? Go to any solar eclipse, and you’ll get your answer: experienced eclipse photographers, solar observers and anyone wanting to safely point a camera or binoculars at the sun very often rely on Baader AstroSolar Filter Film OD 5.0.
Its popularity does not come from its ruggedness nor its out-of-the-box convenience. Whether bought as a loose sheet for making filters or as ready-made Baader solar filters for binoculars, camera lenses and telescopes, it enables super-sharp captures of sunspots on the sun, allowing much faster shutter speeds than some rival solar filter materials.
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https://www.livescience.com/products/optics/baader-astrosolar-filter-film-od-5-0-review
