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Focal Length

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Posted by Martin Curran on June 26, 2001 05:34:55 UTC

I am building a set of 10" binoculars and I am a bit confused on how to get the truss poles the exact length required. I dont know if I should do all of the math and get close (depending upon the eyepeice) or take the darn thing outside and just move it around till I find it. Any ideas ??? Thanks in advance.

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