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10 March 2023 at 12:44 pm
#616187
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Participant
The earlier Baader filters were conventional multilayered coloured glass filters which would explain the interference rings, with I believe a dielectric coating to block IR leaks (I have an old V filter from a different supplier which has delaminated on the edge.) The RGB and latest BVRI filters from Baader (and others) are now a single thickness of dielectric coated glass
Cheers
Robin