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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
First focal plain vs second focal plain
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<blockquote data-quote="dfanonymous" data-source="post: 1821667" data-attributes="member: 97050"><p>The problem isn't just figuring out the relative subtension in sfp per magnification. It's harder to math it then one would think. There's an accuracy issue to deal with in all brands and manufactures of scopes labeled power range. YOUR particular scopes true power range is 5.5673x to 55.6732x even though it's marketed at 5-50x56. Sfp are calibrated for one or two true sub tensions. Everything else is a guess or a lot of preplanned work with several sheets of paper at different power ranges to give you relative sub tension values if trying to get it to work at all power ranges.</p><p>If I miss a .5 mil target by 1.2 mils, I want to know I missed by 1.2 mils, not round about. Especially when working in that small margin for error in particular scenarios. You don't have to do all this with a ffp. You're hold is correct, you measurements are correct. One dunt need to worry about hours of figuring out specific reticle and magnification range calibration, or limit yourself to a particular power range to be precise.</p><p>I'm being particular to long range.</p></blockquote><p></p>
[QUOTE="dfanonymous, post: 1821667, member: 97050"] The problem isn’t just figuring out the relative subtension in sfp per magnification. It’s harder to math it then one would think. There’s an accuracy issue to deal with in all brands and manufactures of scopes labeled power range. YOUR particular scopes true power range is 5.5673x to 55.6732x even though it’s marketed at 5-50x56. Sfp are calibrated for one or two true sub tensions. Everything else is a guess or a lot of preplanned work with several sheets of paper at different power ranges to give you relative sub tension values if trying to get it to work at all power ranges. If I miss a .5 mil target by 1.2 mils, I want to know I missed by 1.2 mils, not round about. Especially when working in that small margin for error in particular scenarios. You don’t have to do all this with a ffp. You’re hold is correct, you measurements are correct. One dunt need to worry about hours of figuring out specific reticle and magnification range calibration, or limit yourself to a particular power range to be precise. I’m being particular to long range. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
First focal plain vs second focal plain
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