My astronomy/telescope skills are not good enough to judge the quality of this film compared to other options but I used it to test a filter 8 inch telescope to make for me and have gotten some very satisfying sunspot shots without frying my camera so it's definitely working for me. Removed color in atmosphere that day and adjusted levels to show more contrast in visible elements; The filter doesn't seem to add any unusual or unpleasant colors to the sun.
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