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Old 05-04-2009, 05:09 PM
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Tunnel Vision

AlexN is offline
Join Date: Mar 2008
Location: Brisbane, Australia
Posts: 6,708
JJJ, Much like a barlow, this will cause your critical focus point (CFP) to move inwards.. Most imaging systems as you know require extension tubes to get the camera back to the CFP.. I dont forsee any focus issues when using one with a telescope..
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