Quote:
Originally Posted by M54
Hi all,
I've been reading about eyepieces and the author is talking about long focal length telescopes and short focal length telescopes.
My telescope is a 130cm, 900mm focal length, f/7 reflector.
Is this a long or short focal length, I don't know what is considered long and short. 
Thanks in advance,
Molly. |
I'm not sure I've ever seen a definition my self but here are my personal guidelines...
Short (Fast) to me is anything less than f/5
Everything else I think of as long (slow)....