Re: Field of View -why aren\'t all 3 X 9\'s the same?
Regardless of the actual power of the scope (which may vary a bit) the real culprit is the diameter of the eyepiece, and the eye relief.
Say that you have two scopes that are exactually 9x. They can have different field of views. This is because of the differences in the diameter of the eyepiece, and the distance to the eye (eye relief) of the scope.
The reasons are the following... think of the diameter of the eyepiece as a window that is looking at the scene. At a fixed distance, the larger the window, the more you see.
And... the closer to the window your eye is, the wider view you have.
This is why a 4x pistol scope has a field of view of ~9 feet, and a 4x rifle scope has a field of ~24 feet.
And... even amoung rifle scopes, a 9x with 3" of eye relief will have a larger field of view than a 9x with a 4.5" eye relief.
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LRH member #23