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03-13-2009, 02:05 AM   #16
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All that math is so far over my head I would need the Palomar observatory telescope to spot it.

What I do is add the length of the tubes (or bellows extension) to the focal length of the lens. Might not be the right answer, but I have had very good luck with that technique.

03-13-2009, 05:30 AM   #17
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QuoteOriginally posted by Mike Cash Quote
All that math is so far over my head I would need the Palomar observatory telescope to spot it.

What I do is add the length of the tubes (or bellows extension) to the focal length of the lens. Might not be the right answer, but I have had very good luck with that technique.
It is the correct answer.

Iowa Dave
03-13-2009, 05:47 AM   #18
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Thanks, Dave. That is comforting to know.
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