Thread: Is a focal ratio on a 80mm APO refractor of f/6.9 too slow?
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Old 22-11-2018, 09:12 AM
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ChrisV (Chris)
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+1 on the advice below, especially adding a flattener/reducer at some stage. An 80mm Apo is a great start for AP. Which one is it? Always worth trying it as it is.
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