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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: 1836162" data-attributes="member: 5302"><p>Even if all the mechanical tolerances were zero, the few percent tolerances in lens focal length can cause the side knob set to 200 yards to position the moving lenses to focus several yards either side.</p><p></p><p>Got a Nightforce high end variable some years ago that when the focus was set at 200 yards, it was parallax free at 100 yards. Called Nightforce to let them know and they asked how I was able to discern that. Told them I used a monocular to magnify the reticle and target image 7 times to see small parallax errors. Returned the scope.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1836162, member: 5302"] Even if all the mechanical tolerances were zero, the few percent tolerances in lens focal length can cause the side knob set to 200 yards to position the moving lenses to focus several yards either side. Got a Nightforce high end variable some years ago that when the focus was set at 200 yards, it was parallax free at 100 yards. Called Nightforce to let them know and they asked how I was able to discern that. Told them I used a monocular to magnify the reticle and target image 7 times to see small parallax errors. Returned the scope. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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