Thread: Is a focal ratio on a 80mm APO refractor of f/6.9 too slow?
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Old 21-11-2018, 11:12 PM
Jethro777 (Jethro)
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Join Date: Oct 2012
Location: Brisbane
Posts: 131
That is so helpful!
Does a field flattener improve or decrease the quality of an observation?
Should the changed focal ratio be considered then when selecting/buying eyepieces?
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