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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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<blockquote data-quote="Bart B" data-source="post: 108734" data-attributes="member: 5302"><p>Chesapeake, all rifle scopes have an eyepiece at the back end to focus the reticule so folks can see it clear and sharp. That's the only reason the eyepiece is adjustable; we each have different eyeball focal lengths and the eyepiece lens compensates for that by being adjustable.</p><p></p><p>Parallax usually causes more problems at short range than long range. The higher the magnification and closer the range, the more problems parallax can cause. This is why pistol scopes have more parallax problems than rifle scopes.</p><p>Learn how to center your eye in the pistol scopes optical axis and there will be no parallax.</p><p></p><p>Note that as long as the aiming eye is on the scope's optical axis, there will be no parallax problem regardless of what range the objective lens is focused at. Which is why there really isn't any such thing as "parallax adjustment" on a scope. Scope makers have confused more people by claiming such a thing, but they don't care.</p><p></p><p>It's not "parallax range" but focused range. The adjustable objective lens is marked from infinity back to some close range in yards, meters, feet, whatever unit the maker chooses. The only thing the front (objective) lens group does when it moves is change the range the target will be sharply focused on the reticule. It has nothing to do with parallax except when the aiming eye ain't on the scopes optical axis.</p><p></p><p>If one sees the reticule move relative to the target, this is a parallax condition that happens only when the scope's focused at a range different than the target AND the aiming eye's off the optical axis. It has nothing to do with the lens spacing.</p></blockquote><p></p>
[QUOTE="Bart B, post: 108734, member: 5302"] Chesapeake, all rifle scopes have an eyepiece at the back end to focus the reticule so folks can see it clear and sharp. That's the only reason the eyepiece is adjustable; we each have different eyeball focal lengths and the eyepiece lens compensates for that by being adjustable. Parallax usually causes more problems at short range than long range. The higher the magnification and closer the range, the more problems parallax can cause. This is why pistol scopes have more parallax problems than rifle scopes. Learn how to center your eye in the pistol scopes optical axis and there will be no parallax. Note that as long as the aiming eye is on the scope's optical axis, there will be no parallax problem regardless of what range the objective lens is focused at. Which is why there really isn't any such thing as "parallax adjustment" on a scope. Scope makers have confused more people by claiming such a thing, but they don't care. It's not "parallax range" but focused range. The adjustable objective lens is marked from infinity back to some close range in yards, meters, feet, whatever unit the maker chooses. The only thing the front (objective) lens group does when it moves is change the range the target will be sharply focused on the reticule. It has nothing to do with parallax except when the aiming eye ain't on the scopes optical axis. If one sees the reticule move relative to the target, this is a parallax condition that happens only when the scope's focused at a range different than the target AND the aiming eye's off the optical axis. It has nothing to do with the lens spacing. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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