Thread: Focus straight through refractor tube (i/e/, w/out diagonal)
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Old 21-01-2009, 06:30 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
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The typical star diagonal takes about 50mm of back focus, so if you view straight through you'll probably need a 50mm extension tube. They're available in both 1.25" and 2" sizes.
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