Thread: Problems focusing WO SWAN 33 mm EP in Megrez 90
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Old 02-05-2013, 08:32 AM
Kunama
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Kunama is offline 		 
Join Date: Sep 2012
Posts: 3,588
Bruce it might be due to the Feathertouch focuser causing a shorter lightpath for astrophotography or binoviewer applications so you may indeed need a short extension tube.
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