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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: 94828" data-attributes="member: 5302"><p>Jonny, I understand why you've disagreed with what I said. I too, have looked through a few scopes that had parallax when the target image was focused very sharply. Here's how it happened.</p><p></p><p>In every instance, the scope's eyepiece was not focused properly on the reticule but instead either in front of it or in back of it. When the scope's front lens was turned/moved to focus a sharp image for the user, that image was in the same plane as the eyepiece was focused at. And yes, the reticule appeared to move relative to the target when the eye was moved around behind the scope. This is a common occurance.</p><p></p><p>Now here's the rest of the story. When the scope's eyepiece was correctly focused on the reticule, then the scope's front/objective lens was refocused for the sharpest image, the reticule no longer moved on the target as the eye moved around behind the scope.</p><p></p><p>It is opto-physically impossible for a scope sight to have its reticule appear to move relative to the target when the eye's moved around looking through the eyepiece when the target image and eyepiece are both properly focused on the reticule.</p></blockquote><p></p>
[QUOTE="Bart B, post: 94828, member: 5302"] Jonny, I understand why you've disagreed with what I said. I too, have looked through a few scopes that had parallax when the target image was focused very sharply. Here's how it happened. In every instance, the scope's eyepiece was not focused properly on the reticule but instead either in front of it or in back of it. When the scope's front lens was turned/moved to focus a sharp image for the user, that image was in the same plane as the eyepiece was focused at. And yes, the reticule appeared to move relative to the target when the eye was moved around behind the scope. This is a common occurance. Now here's the rest of the story. When the scope's eyepiece was correctly focused on the reticule, then the scope's front/objective lens was refocused for the sharpest image, the reticule no longer moved on the target as the eye moved around behind the scope. It is opto-physically impossible for a scope sight to have its reticule appear to move relative to the target when the eye's moved around looking through the eyepiece when the target image and eyepiece are both properly focused on the reticule. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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