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Wanted: Simple Focal Length Measurement Method

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Posted by Steve/">Steve on November 3, 1998 16:56:11 UTC

Looking for a fairly simple way to verify (or determine) the true focal length of a primary mirror. Anyone who can describe requirements to a novice - I would sure appreciate it! (FYI.. it's supposed to be f4.5 if that helps.. 16". Should focus at 72"...

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