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Old August 30, 2013, 11:36 AM   #6
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Join Date: August 1, 2010
Posts: 608
Field of view is determined by the overall design of the individual scope, especially the design of the eyepiece.

Scopes designed for shorter eye relief often have a slightly wider fov.
2 different 3-9x40s often have different fovs.
A bigger objective lens does not mean a wider fov. 1-4x20s have wide fovs. A 3-9x50 does not usually have a wider fov than a 3-9x40.
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