Thread: Help converting GSO 2" 2x ED barlow to 3x?
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Old 31-08-2010, 09:19 PM
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asimov (John)
Planet photographer

asimov is offline 		 
Join Date: May 2005
Location: Bundaberg
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It's hard to say, but I sometimes use a 100mm extension tube with my 2X barlow but it's not quite as big as using my 3X....(Talking jupiter here for example).

The televue site has a chart online that will tell you more than I could.
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