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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Mil-Dot Question - Confused
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<blockquote data-quote="sscoyote" data-source="post: 361285" data-attributes="member: 1133"><p>TLK-- You're going to have to go through a bit of an education here when it comes to multi-stadia reticles in 2nd and 1st focal plane scopes. As has been mentioned most optics use a reticle in the 2nd FP. When u change the power in this type of scope the IMAGE gets bigger while the reticle remains the same size. Which means that the measurment (subtension) between stadia points change as power is changed. This can easily be seen with any scope with a plex-style reticle right out the window of your house. Discreetly pick a tgt. at any distance. While keeping the center X on any point on that tgt. change the power and note where the plex post tips line up on that tgt. As u increase the power the post will get higher on the tgt., or more importantly, the subtension between X and PPT gets smaller. This is why u can only rangefind at 1 power, unless u know what the subtension is at some other power. So in 2FP optics the mil-dot is only accurate at 1 power...BUT it can be used at any other power using the mil-dot mil-relation formula by punching in the subtension at any power u choose. To save time study my last posting on this thread to understand how that works--</p><p></p><p><a href="http://www.longrangehunting.com/forums/f18/mrad-vs-moa-52395/index5.html" target="_blank">http://www.longrangehunting.com/forums/f18/mrad-vs-moa-52395/index5.html</a></p><p></p><p>If u have a multi-stadia reticle that's located in the 1st focal plane the reticle changes size as the power is changed. Consequently the measurement between stadia points doesn't change with the power (u can rangefind and downrange zero on any power). U will know if u have a 1st FP reticle as it will catch u by surprise the 1st time u look thru it and change the power.</p></blockquote><p></p>
[QUOTE="sscoyote, post: 361285, member: 1133"] TLK-- You're going to have to go through a bit of an education here when it comes to multi-stadia reticles in 2nd and 1st focal plane scopes. As has been mentioned most optics use a reticle in the 2nd FP. When u change the power in this type of scope the IMAGE gets bigger while the reticle remains the same size. Which means that the measurment (subtension) between stadia points change as power is changed. This can easily be seen with any scope with a plex-style reticle right out the window of your house. Discreetly pick a tgt. at any distance. While keeping the center X on any point on that tgt. change the power and note where the plex post tips line up on that tgt. As u increase the power the post will get higher on the tgt., or more importantly, the subtension between X and PPT gets smaller. This is why u can only rangefind at 1 power, unless u know what the subtension is at some other power. So in 2FP optics the mil-dot is only accurate at 1 power...BUT it can be used at any other power using the mil-dot mil-relation formula by punching in the subtension at any power u choose. To save time study my last posting on this thread to understand how that works-- [url]http://www.longrangehunting.com/forums/f18/mrad-vs-moa-52395/index5.html[/url] If u have a multi-stadia reticle that's located in the 1st focal plane the reticle changes size as the power is changed. Consequently the measurement between stadia points doesn't change with the power (u can rangefind and downrange zero on any power). U will know if u have a 1st FP reticle as it will catch u by surprise the 1st time u look thru it and change the power. [/QUOTE]
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Long Range Scopes and Other Optics
Mil-Dot Question - Confused
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