Quote:
Originally Posted by Octane
I can only say good things about my Baader filters. At f/5 on my FSQ, I can assure you that they're not parfocal. I autofocus every 30 minutes, anyway, so, it's no big deal.
H
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Beg to differ.
Baaders are indeed par focal...but my FSQ isn't.
At F5 you can see the RGB focal points shift ever so slightly (some camera lenses behave the same way)
I get the same behaviour with AstroDons and Custom Scientific sets.
Same filters on my AP scopes, no refocus is required.