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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Ocular focus & shifting POI... any optics experts here?
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<blockquote data-quote="Timber338" data-source="post: 1241345" data-attributes="member: 33822"><p>So unfortunately this seems to be one of those mystery problems. The gun and load are dialed tried and true. About a week ago (prior to adjusting the ocular) I shot several groups at long range which varied between the .1 and .3 moa out to 1000 yards. </p><p></p><p>I talked with Vortex at length which included two different phone calls and two different answers from them about whether or not POI could be changed by rotating the ocular. In the end they went to their engineers and confirmed that theoretically there would not be any POI shift. </p><p></p><p>As Phorwath pointed out it could happen for example if the scope has a defect. </p><p></p><p>Vortex suggested it could be a parallax issue. I somewhat doubt that due to the small group size (sub 1/4 moa) that the rifle was shooting before I focused the ocular as well as after. The accuracy of the rifle remains in either scenario. I guess if I held my cheek weld consistent I could still shoot accurate groups to a consistent POI with a parallax issue but at sub 1/4 moa I think that would pretty darn hard to do. </p><p></p><p>And if the rifle were experiencing some kind of defect to cause POI shift, it seems like it would also negatively impact group size as well. It's hard to imagine a scope defect that only jumps bullet POI between groups... but because of how consistent this rifle has been, the new scope has me concerned.</p></blockquote><p></p>
[QUOTE="Timber338, post: 1241345, member: 33822"] So unfortunately this seems to be one of those mystery problems. The gun and load are dialed tried and true. About a week ago (prior to adjusting the ocular) I shot several groups at long range which varied between the .1 and .3 moa out to 1000 yards. I talked with Vortex at length which included two different phone calls and two different answers from them about whether or not POI could be changed by rotating the ocular. In the end they went to their engineers and confirmed that theoretically there would not be any POI shift. As Phorwath pointed out it could happen for example if the scope has a defect. Vortex suggested it could be a parallax issue. I somewhat doubt that due to the small group size (sub 1/4 moa) that the rifle was shooting before I focused the ocular as well as after. The accuracy of the rifle remains in either scenario. I guess if I held my cheek weld consistent I could still shoot accurate groups to a consistent POI with a parallax issue but at sub 1/4 moa I think that would pretty darn hard to do. And if the rifle were experiencing some kind of defect to cause POI shift, it seems like it would also negatively impact group size as well. It's hard to imagine a scope defect that only jumps bullet POI between groups... but because of how consistent this rifle has been, the new scope has me concerned. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Ocular focus & shifting POI... any optics experts here?
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