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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: 66533" data-attributes="member: 1622"><p>Ward,</p><p></p><p>A few days ago, you said this: </p><p>[ QUOTE ]</p><p> Another area of maintaining your zero can be affected by the light and wind. If you zero in full sun-light and then shoot in an overcast condition, (shadow effect) your poi will be ½" low at 100 yards. If the sun is at 9:00, poi will be ¼" right. If it is at 3:00, poi will be ¼" left. </p><p> </p><p></p><p>[/ QUOTE ] </p><p></p><p>Couldn't explain the light theories (in terms of scope use) to myself in common sense terms but:</p><p></p><p>...over the last 2 days, with dark overcast alternating with bright sunshine, I have absolutely 100% smacked-in-the-face seen the 1/2 minute up/down taking place. /ubbthreads/images/graemlins/ooo.gif </p><p></p><p>Grateful if you'd have a squint at this thread:</p><p><a href="http://longrangehunting.com/ubbthreads/showflat.php?Cat=0&amp;Board=UBB3&amp;Number=58820&amp;Searchpage=1&amp;Main=58054&amp;Words=zero+shift+Brown+Dog&amp;topic=&amp;Search=true#Post58820" target="_blank">http://longrangehunting.com/ubbthreads/s...=true#Post58820</a> </p><p></p><p>to see what yout take would have been on the situation.......</p><p></p><p>have you any other 'not widely known' zero shift tips (ie other than wind , temp, humidity, pressure)that you'd be willing to share?</p></blockquote><p></p>
[QUOTE="Brown Dog, post: 66533, member: 1622"] Ward, A few days ago, you said this: [ QUOTE ] Another area of maintaining your zero can be affected by the light and wind. If you zero in full sun-light and then shoot in an overcast condition, (shadow effect) your poi will be ½” low at 100 yards. If the sun is at 9:00, poi will be ¼” right. If it is at 3:00, poi will be ¼” left. [/ QUOTE ] Couldn't explain the light theories (in terms of scope use) to myself in common sense terms but: ...over the last 2 days, with dark overcast alternating with bright sunshine, I have absolutely 100% smacked-in-the-face seen the 1/2 minute up/down taking place. [img]/ubbthreads/images/graemlins/ooo.gif[/img] Grateful if you'd have a squint at this thread: [url="http://longrangehunting.com/ubbthreads/showflat.php?Cat=0&Board=UBB3&Number=58820&Searchpage=1&Main=58054&Words=zero+shift+Brown+Dog&topic=&Search=true#Post58820"]http://longrangehunting.com/ubbthreads/s...=true#Post58820[/url] to see what yout take would have been on the situation....... have you any other 'not widely known' zero shift tips (ie other than wind , temp, humidity, pressure)that you'd be willing to share? [/QUOTE]
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Zero Shift caused by light conditions - question for W
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