Thread: best scope for DLSR photography
View Single Post
  #10  
Old 05-10-2019, 06:35 PM
poider (Peter)
Registered User

poider is offline 		 
Join Date: Apr 2012
Location: Adelaide, Australia
Posts: 224
So how is the focal length determined, I have a 600mm long refractor with a focal length of 600 but my sigma 150-500mm is no where near 500mm it is just over 350mm long
Reply With Quote