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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Ffp vs sfp
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<blockquote data-quote="Euler" data-source="post: 2104801" data-attributes="member: 107601"><p>As already said, the advantage to FFP is that the reticle is always correct.</p><p></p><p>For SFP, you need to know exactly what magnification you are on and then proportion the reticle. A couple problems with this:</p><p></p><p>-Magnification rings are not always marked correctly. You won't know if you're on 11 or 10.2 or 11.6, and so there is inherent error here. You also won't find a magnification ring marked at every single power interval, so you are tying your hands on how much of the optic you can actually use with SFP reticle. So while in theory you could proportion the subtensions based on the magnification, in practice, not so much. As an option, you can use a calibrated chart and mark out every magnification interval, but you'd still be subject to the next problem.</p><p>-Another issue is that under any sort of stress (hunting, competition, etc.) you are setting yourself up for failure by adding an additional step in your process, which is contingent on your ability to perform quick arithmetic. For every shot, you'll need to quickly figure your reticle subtension times the max magnification (or whichever mag the reticle is set to), and then divide by the magnification that you are currently on. Again, you're unnecessarily baking inherent error potential into the process.</p><p></p><p>For long range hunting/practical rifle, a SFP reticle is a liability. With a variable power scope, you should be setting the magnification for the distance you are shooting. A FFP reticle may be "small" in appearance on low mag, but think about the distances that you would shoot on low mag - you only need a duplex in that scenario. Basically every FFP reticle will be useable at 5x or 6x and higher.</p></blockquote><p></p>
[QUOTE="Euler, post: 2104801, member: 107601"] As already said, the advantage to FFP is that the reticle is always correct. For SFP, you need to know exactly what magnification you are on and then proportion the reticle. A couple problems with this: -Magnification rings are not always marked correctly. You won't know if you're on 11 or 10.2 or 11.6, and so there is inherent error here. You also won't find a magnification ring marked at every single power interval, so you are tying your hands on how much of the optic you can actually use with SFP reticle. So while in theory you could proportion the subtensions based on the magnification, in practice, not so much. As an option, you can use a calibrated chart and mark out every magnification interval, but you'd still be subject to the next problem. -Another issue is that under any sort of stress (hunting, competition, etc.) you are setting yourself up for failure by adding an additional step in your process, which is contingent on your ability to perform quick arithmetic. For every shot, you'll need to quickly figure your reticle subtension times the max magnification (or whichever mag the reticle is set to), and then divide by the magnification that you are currently on. Again, you're unnecessarily baking inherent error potential into the process. For long range hunting/practical rifle, a SFP reticle is a liability. With a variable power scope, you should be setting the magnification for the distance you are shooting. A FFP reticle may be "small" in appearance on low mag, but think about the distances that you would shoot on low mag - you only need a duplex in that scenario. Basically every FFP reticle will be useable at 5x or 6x and higher. [/QUOTE]
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Ffp vs sfp
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