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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
second image plane
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<blockquote data-quote="Bart B" data-source="post: 110403" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>... a FFP can have FOCUS induced POI shift. Esp devices with ROTATIONAL front focus. It's RARE but possible.</p><p></p><p>[/ QUOTE ]Agreed. That happens when the objective lens isn't mounted square with its rotational axis; it's cocked a little. The focused image is a bit off the mechanical axis and its center will be seen to rotate about the reticule center as the objective lens barrel is rotated.</p></blockquote><p></p>
[QUOTE="Bart B, post: 110403, member: 5302"] [ QUOTE ] ... a FFP can have FOCUS induced POI shift. Esp devices with ROTATIONAL front focus. It's RARE but possible. [/ QUOTE ]Agreed. That happens when the objective lens isn't mounted square with its rotational axis; it's cocked a little. The focused image is a bit off the mechanical axis and its center will be seen to rotate about the reticule center as the objective lens barrel is rotated. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
second image plane
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