Thread: Bintel BT-252
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  #30  
Old 13-08-2019, 10:54 PM
croweater (Richard)
Don't Panic!

croweater is offline 		 
Join Date: Feb 2015
Location: Mount Gambier, South Australia
Posts: 531
Excellent post Les. Is there an equation to work out the smallest secondary mirror size possible for a certain aperture and focal ratio without losing light. Cheers, Richard.
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