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I used a Baader film on my 6" f8 refractor. I bought the version made for a 6" Newt that is the same size as the dewshield, so I taped it on with duct tape.
I now have it in an ATM dewshield for my ATM 6" f12 refractor. Some/a lot say the film is better than the glass, but I have never used glass. Film is a lot cheaper. Myastro shop sells all this stuff.
Matt
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