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Re: [ATM] Back Focal Distance design considerations
i'll add to what the others have said only three things from personal
experience:
leave room for focus changes necessary when you or your fellow observers
need to refocus when removing your eyeglasses.
leave room for focus changes necessary when you introduce filters into the
path.
leave room for focus changes that may be necessary when you need to tilt the
base of the focuser to square it to the optical path.
good uck
jtm
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