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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Zero Shift caused by light conditions - question for W
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<blockquote data-quote="Brown Dog" data-source="post: 66633" data-attributes="member: 1622"><p>Ward,</p><p></p><p>Thanks. I don't get enough trigger time to note all these effects definitively; but after your bright/overcast heads-up, I suddenly noticed the effect in action.</p><p></p><p>I'll look for these effects as the situations present themselves.</p><p></p><p>So far I've got: </p><p></p><p>Zero in bright light, then fire in overcast, MPI drops 0.5MOA (or, conditions vice-versa , MPI rises 0.5MOA)</p><p></p><p>Sun low behind, MPI drops 0.25MOA (is the same true of infront?)</p><p></p><p>and sun left or right , MPI shifts O.25MOA away from the sun.</p><p></p><p>Is that correct?</p><p></p><p></p><p>3sixbits,</p><p></p><p>Thanks for your input, I'm not a target shooter, but I always understood -in a military context- 'Lights up, sights up' to be a cry that relates to iron battle sights. [and, in that context, as being based on the fact that -in good light- people tend to underestimate target distances]</p><p></p><p>I understand how, with iron sights light may affect aiming, but....</p><p></p><p>What we appear to have here, with <em>scopes</em> , is (with a known target distance) actually the opposite:</p><p></p><p> <em>'Light's down, sights up!'</em> /ubbthreads/images/graemlins/smile.gif</p></blockquote><p></p>
[QUOTE="Brown Dog, post: 66633, member: 1622"] Ward, Thanks. I don't get enough trigger time to note all these effects definitively; but after your bright/overcast heads-up, I suddenly noticed the effect in action. I'll look for these effects as the situations present themselves. So far I've got: Zero in bright light, then fire in overcast, MPI drops 0.5MOA (or, conditions vice-versa , MPI rises 0.5MOA) Sun low behind, MPI drops 0.25MOA (is the same true of infront?) and sun left or right , MPI shifts O.25MOA away from the sun. Is that correct? 3sixbits, Thanks for your input, I'm not a target shooter, but I always understood -in a military context- 'Lights up, sights up' to be a cry that relates to iron battle sights. [and, in that context, as being based on the fact that -in good light- people tend to underestimate target distances] I understand how, with iron sights light may affect aiming, but.... What we appear to have here, with [i]scopes[/i] , is (with a known target distance) actually the opposite: [i]'Light's down, sights up!'[/i] [img]/ubbthreads/images/graemlins/smile.gif[/img] [/QUOTE]
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Zero Shift caused by light conditions - question for W
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