Thread: Focal ratio
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  #7  
Old 27-07-2009, 04:34 PM
gmbfilter (Geoff)
Geoff

gmbfilter is offline 		 
Join Date: Mar 2007
Location: South Tacoma NSW
Posts: 571
Here is a link to some telescope formulas.http://www.televue.com/engine/page.asp?ID=141.they have some useful info
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