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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: 94249" data-attributes="member: 5302"><p>Jon A, putting the reticule in the first image plane (primary focus of the objective/front lens) does nothing for parallax. There'll always be instances when the reticule and target image aren't on the same plane.</p><p></p><p>And doing this will also let the reticule increase in size (thickness) as magnification is increased 'cause the two sets of lenses in the erector tube moving front to back is what changes magnification. </p><p></p><p>Reticules in the first image plane also appear to move off center as elevation and windage adjustments are made. This happens 'cause the back of the erector tube is fixed and the front points to a different place in that first image. The only way to fix this is to anchor the erector tube's front end at the first image plane then move the adjustment turret back closer to the eyepiece. Which wouldn't be a bad idea 'cause the adjustments would be easier to reach.</p></blockquote><p></p>
[QUOTE="Bart B, post: 94249, member: 5302"] Jon A, putting the reticule in the first image plane (primary focus of the objective/front lens) does nothing for parallax. There'll always be instances when the reticule and target image aren't on the same plane. And doing this will also let the reticule increase in size (thickness) as magnification is increased 'cause the two sets of lenses in the erector tube moving front to back is what changes magnification. Reticules in the first image plane also appear to move off center as elevation and windage adjustments are made. This happens 'cause the back of the erector tube is fixed and the front points to a different place in that first image. The only way to fix this is to anchor the erector tube's front end at the first image plane then move the adjustment turret back closer to the eyepiece. Which wouldn't be a bad idea 'cause the adjustments would be easier to reach. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Parallax vs Focus
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