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Tennessee Gun Owners Forums
Rifles
First or Second Focal Planes?
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<blockquote data-quote="backroads" data-source="post: 2886498" data-attributes="member: 9388"><p>It's different than the adjustable objective. It has to deal with where the rectile is installed and how it does or does not increase as you adjust magnification. Here is a link to a pdf that explains it pretty good: <a href="http://www.precisionshooting.com.au/downloads/scopesffpvssfp(1" target="_blank">http://www.precisionshooting.com.au/dow ... ffpvssfp(1</a>).pdf</p><p></p><p>In short the front focal plane (cross hairs) increase or decrease when the magnification is increased/decreased along with the target you are looking at. Holding the target true at any magnification. </p><p></p><p>Whereas a second focal plane scope the focal plane (cross hairs) remains one constant size when increasing or decreasing the magnification of your target. So if you sight in your 3x9 power scope at 9 then that is what it is truly sighted in for. If you shoot your target at 3 power it will be slightly off. At a 100 yards not a big deal, but at 400 yards that diffeence can add up. (not that I could shoot 400 yards at 3 power!)</p><p></p><p>At least that is my understanding of it.</p></blockquote><p></p>
[QUOTE="backroads, post: 2886498, member: 9388"] It's different than the adjustable objective. It has to deal with where the rectile is installed and how it does or does not increase as you adjust magnification. Here is a link to a pdf that explains it pretty good: [url=http://www.precisionshooting.com.au/downloads/scopesffpvssfp(1]http://www.precisionshooting.com.au/dow ... ffpvssfp(1[/url]).pdf In short the front focal plane (cross hairs) increase or decrease when the magnification is increased/decreased along with the target you are looking at. Holding the target true at any magnification. Whereas a second focal plane scope the focal plane (cross hairs) remains one constant size when increasing or decreasing the magnification of your target. So if you sight in your 3x9 power scope at 9 then that is what it is truly sighted in for. If you shoot your target at 3 power it will be slightly off. At a 100 yards not a big deal, but at 400 yards that diffeence can add up. (not that I could shoot 400 yards at 3 power!) At least that is my understanding of it. [/QUOTE]
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Tennessee Gun Owners Forums
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First or Second Focal Planes?
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