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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: 2206428" data-attributes="member: 5302"><p>The closer the target is, the more critical focusing the scope on target is. If target is 400 yards away and the scope is focused at 200, the parallax error is negligible</p><p></p><p>If your eye is on the scope's optical axis, there's no parallax regardless of the range the scope's focused at.</p><p></p><p>Technically speaking, scopes only have a range focus adjustment. Human's cause parallax problems when their eye's not on the scope's optical axis.</p><p></p><p>This parallax issue started when scope's range focus was controlled by a knob opposite the windage knob and some well meaning person didn't think it could possibly focus the scope on target like twisting the objective lens does. In spite of patent drawings saying it's a focus adjustment:</p><p></p><p>[URL unfurl="true"]https://patents.google.com/patent/US4643542A/en[/URL]</p></blockquote><p></p>
[QUOTE="Bart B, post: 2206428, member: 5302"] The closer the target is, the more critical focusing the scope on target is. If target is 400 yards away and the scope is focused at 200, the parallax error is negligible If your eye is on the scope's optical axis, there's no parallax regardless of the range the scope's focused at. Technically speaking, scopes only have a range focus adjustment. Human's cause parallax problems when their eye's not on the scope's optical axis. This parallax issue started when scope's range focus was controlled by a knob opposite the windage knob and some well meaning person didn't think it could possibly focus the scope on target like twisting the objective lens does. In spite of patent drawings saying it's a focus adjustment: [URL unfurl="true"]https://patents.google.com/patent/US4643542A/en[/URL] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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