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Old May 4, 2013, 05:59 AM   #6
Bart B.
Senior Member
Join Date: February 15, 2009
Posts: 6,318
Why do folks focusing their scopes at different ranges by moving its front lens group call this function "adjusting parallax" when focusing is in the line of sight and puts the target image on the reticule axis and parallax is apparent image movement near the scope's reticule plane at right angles to the line of sight when the scope is not focused at target range? Especially when the aiming eye's on the optical axis, there will never be any parallax regardless of where the scope's focused at.

The movement of binocular, telescope and camera lenses for different distances is called "focusing" and so was the same thing on rifle scopes for decades.
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Last edited by Bart B.; May 4, 2013 at 06:17 AM.
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