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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: 66590" data-attributes="member: 1622"><p>Ward,</p><p></p><p>All well over here thanks. Hope you saw my pic of the ACI mounted over on the Gen Disc section /ubbthreads/images/graemlins/cool.gif</p><p></p><p>I am fascinated by this light-caused zero shift. As you saw on the linked thread, my MPI had dropped 2cm (0.79in)when I check zeroed at 100m in Scotland. It then returned to zero when I fired at home. Never explained it to myself, didn't consider light at all! But now light could be the bulk of the answer! I need to play with this.</p><p></p><p>Some more questions:</p><p></p><p>I imagine the answer to this one is 'yes', but are you confident enough in the effect that once you've IDed the light condition you dial it as a change?</p><p></p><p>How 'binary' is the concept; ie is it 'bright = on, overcast = up 0.5moa'.</p><p></p><p>or do you have 'shades of grey (gray!)'? [literally in this case!] For eg: 'slightly overcast = up 0.25', 'dusk = up 0.75' ?</p><p></p><p>Is there on IDed effect for sun infront/behind? ie firing towards/away from the rising/setting sun</p><p></p><p>Apologies for the 'twenty questions' nature of that; but thanks in advance!</p><p></p><p>[My brain is currently giving me 'does-not-compute' on the tailwind MPI drop though! /ubbthreads/images/graemlins/smile.gif I'll need to give that one a lot of brain time. What are your thoughts on the effect of headwind? </p><p>Is your tailwind concept cumulative? ie would 10mph push it down 1 MOA?]</p></blockquote><p></p>
[QUOTE="Brown Dog, post: 66590, member: 1622"] Ward, All well over here thanks. Hope you saw my pic of the ACI mounted over on the Gen Disc section [img]/ubbthreads/images/graemlins/cool.gif[/img] I am fascinated by this light-caused zero shift. As you saw on the linked thread, my MPI had dropped 2cm (0.79in)when I check zeroed at 100m in Scotland. It then returned to zero when I fired at home. Never explained it to myself, didn't consider light at all! But now light could be the bulk of the answer! I need to play with this. Some more questions: I imagine the answer to this one is 'yes', but are you confident enough in the effect that once you've IDed the light condition you dial it as a change? How 'binary' is the concept; ie is it 'bright = on, overcast = up 0.5moa'. or do you have 'shades of grey (gray!)'? [literally in this case!] For eg: 'slightly overcast = up 0.25', 'dusk = up 0.75' ? Is there on IDed effect for sun infront/behind? ie firing towards/away from the rising/setting sun Apologies for the 'twenty questions' nature of that; but thanks in advance! [My brain is currently giving me 'does-not-compute' on the tailwind MPI drop though! [img]/ubbthreads/images/graemlins/smile.gif[/img] I'll need to give that one a lot of brain time. What are your thoughts on the effect of headwind? Is your tailwind concept cumulative? ie would 10mph push it down 1 MOA?] [/QUOTE]
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