Although the scope's eyepiece focus should be factory-set for 20/20 vision, don't assume it's properly set, since someone could have futzed around with it or maybe you're inheriting the scope from a previous shooter with slightly different vision.
I'm talking about focusing on the reticle, not the ability to see objects through the scope. An in-focus reticle with crisp edges and crosshairs enhances precision shooting. Depending on your scope, you'll find that the rear eyepiece or a threaded ring direcdy in front of it is rotated to adjust eyepiece focus.
The trick to adjusting reticle focus is to aim your scope at a neutral background, such as the sky or a white wall, so you concentrate purely on focusing the reticle itself.
Also, while adjusting, make sure you don't look through the scope too much or your eye will adjust itself and fool you into thinking the reticle's in focus. Only check the focus for a few seconds, then pull your head away, adjust, then look again—but only for two or three seconds.
If you've taken the time to focus correcdy on your reticle, you will have greatly reduced later problems with your target being in focus but your crosshairs appearing fuzzy. After reaching age 40, most riflemen experience a subtle decline in close-distance vision, making it imperative to refocus the reticle at least annually for crisp aiming.
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