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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Mirage - how much point of impact shift?
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<blockquote data-quote="Dave King" data-source="post: 20864" data-attributes="member: 3"><p>Len</p><p></p><p> I don't have a measure of the amount of apparent target movement due to mirage but I'd think one could build a grid and measure it.</p><p></p><p> Perhaps a grid of alternating black and white squares (checker board) with a center aim point. Pick a day with appreciable mirage and setup at 100 yards. Record the outer bounds of the distortion. It'd be nice if the wind was from only one direction rather than switching but a series of wind flags would be a good indicator.</p><p></p><p> I saw some pictures that Ian M. took through his riflescopes and tried it with my video camera. It works well enough and I'd imagine that if you built a contraption to mount a video behind a scope you could record onto video the entire mirage determination affair against the grid.</p><p></p><p> I'd do this in one sitting and not a time-lapse series.</p><p></p><p>[ 07-04-2001: Message edited by: Dave King ]</p></blockquote><p></p>
[QUOTE="Dave King, post: 20864, member: 3"] Len I don't have a measure of the amount of apparent target movement due to mirage but I'd think one could build a grid and measure it. Perhaps a grid of alternating black and white squares (checker board) with a center aim point. Pick a day with appreciable mirage and setup at 100 yards. Record the outer bounds of the distortion. It'd be nice if the wind was from only one direction rather than switching but a series of wind flags would be a good indicator. I saw some pictures that Ian M. took through his riflescopes and tried it with my video camera. It works well enough and I'd imagine that if you built a contraption to mount a video behind a scope you could record onto video the entire mirage determination affair against the grid. I'd do this in one sitting and not a time-lapse series. [ 07-04-2001: Message edited by: Dave King ] [/QUOTE]
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Mirage - how much point of impact shift?
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