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Old 28-09-2013, 08:50 AM
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naskies (Dave)
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Join Date: Jul 2011
Location: Brisbane
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I think the WO FF IV eats up a lot of back focus - I wasn't able to get it to work with a SW ED80 either. There will be other flatteners that use up less back focus.

Have you tried focusing without a flattener at all, i.e. DSLR attached straight to the refractor? This will give you an idea of how much back focus you have to work with.
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