Info  Votes  Messages  More Stats  Up One Level
Subject: Focal Length
By: Anonymous (
Date: 03/13/2002 05:28:14 am PDT
To: Anonymous (

Unless I'm missing something here, I don't see why you are saying there are two different eyepiece magnifications based on Sky&Telescopes 121mm aperture finding.

Smaller aperture has nothing to with focal length. It does affect focal ratio (12.1 vs 12.7), which isn't used to calculate magnification.

Since the primary mirror moves for focusing, it does affect focal length. So until someone actually measures and describes what is going on here, 1540 is the only known focal length to use for eyepiece magnification calculations.

Original Thread Topic Next Message(Newer)
Post Un-related Message

Back to message list

[Click Here to Login]
Don't have a login? Register!