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Old 04-25-2012, 11:42 AM
OKFC05 OKFC05 is offline
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Originally Posted by RolandW View Post
Having worked as a photographer, it seems that parallax has a slightly different meaning when it comes to scopes. I've done a lot of reading about rifle optics over the past couple of months, but haven't seen the "moving crosshairs" problem explained so succinctly. Thanks. So when a scope is described as "parallax-free at X yards," that means that at X yards and beyond, the crosshairs won't appear to move when you move your eye?
Technically, parallax can only be set exactly for one distance perfectly. However, as with focus and depth of field in camera lenses, it is much more critical at short distances and high magnification (long focal length). So setting a .22 scope to be parallx free (the crosshairs are in the same optical plane as the image) at 50yds makes it pretty close from 15yds to 100yds with 4X magnification.

Even moving the parallax setting to 100yds causes problems at 50yds and under, where most .22 shooting is done.

The people posting that AO focusing alone solves the parallax problem obviously don't understand parallax and scope optics.

Fully compensated and completely adjustable scopes are exceptionally expensive, and completely out of place on a .22, especially a plinker-grade semi-auto. With one, you can adjust out parallax error at any normal distance. But with the M&P .22 it would be like measuring with a micrometer, marking with chalk and cutting with an axe.
Save those scopes for ultimate sniping.
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