Quote:
Originally Posted by pelu
A question... the Bahtinov mask works when I use a x2 barlow? Hum! I´m writing it and I´m answering myself "of course, stupid!" I will do a mask. I have one from my 10" but I feel is nor usable. And It need a hole for the secondary support. OK.
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Yeah the mask works at any focal length, or at least that's my understanding
I didn't fancy an afternoon wielding scissors or a knife, so I bought mine but it worked at f/10 and f/25
