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Posted by Robert May on October 27, 2002 20:47:52 UTC

THe minimum is the distance that is produced by the angle of the top of the focuser tube away from the scope opening when the focuser is fully in to the bottom of the focuser towards the opening of the scope. The idea here is to mask off the light that may be coming in the scope from being able to hit the EP without having to do a bunch of bouncing about to get there. Every bounce takes a lot of the light intensity from the beam and that reduces the light that survives to illuminate the image you are seeing in the EP.

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