Thread: Is a focal ratio on a 80mm APO refractor of f/6.9 too slow?
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  #9  
Old 24-11-2018, 12:01 AM
Wavytone
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Join Date: Jul 2008
Location: Killara, Sydney
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Agreed for an 80mm that’s as good as it gets unless you’re preparedness to pay a great deal more for something exotic.
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