Quote:
Originally Posted by DarkArts
I've always erred on the safe side and put a 2" UV/IR cut in front of the diagonal with my Quark and ED80. But I'd always thought it was recommended at or above 80mm aperture anyway.
PS: doesn't she have the coolest name in astronomy?  |
I did say that one is needed on the diagonal just not on the front ?
"Refractors above 80mm up to 150mm: must at least have a UV/IR cut
filter/ You can use a front mount ERF if you want."