Thread: significance of F number vs Focal length and Aperture
View Single Post
  #5  
Old 09-04-2017, 02:12 PM
torana68's Avatar
torana68 (Roger)
Registered User

torana68 is offline 		 
Join Date: Jul 2008
Location: ACT/NSW
Posts: 786
and yes its a good reason to have at least two telescopes
Reply With Quote