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The true field of view through a telescope is determined by 2 things only:-
1. the focal length of the objective.
2. the field stop diameter of the eyepiece.
The 2nd point also determines the AFOV of the eyepiece, like a Nagler has an 82 deg AFOV, Pentax XW has 70 deg FOV etc etc.
I don't have time to elaborate further on this at present as I am at work, but I will explain in more detail tonite when I get home.
CS-John B
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