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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Advantages of "second focal plane?"
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<blockquote data-quote="RuffHewn" data-source="post: 17020" data-attributes="member: 1358"><p>Sakofan, I agree with HBar. I had this exact decision to make, either the IOR 2.5-10x with illuminated MP8 reticle in the 1st plane or the non illum version with the MP8 in the 2nd plane. I went with the illuminated version only because it is in the 1st plane but have found other good reasons for having the illum reticle since.</p><p></p><p></p><p>To answer your question:</p><p></p><p>1st focal plane reticle appears to enlarge, looking only at the reticle, as you increase the scope magnification. Advantage is it maintains it's size in relation to the tgt so that the mil marks can be referenced at any magnification. Disadvantage is at 2.5x the reticle is fairly thin and can be lost against a dark tgt in low light, but the illum feature prevents this. Also worth noting the is IOR illum scope does not have the heavy bars at the top of the horizontal stadia and the sides of the vertical stadia so it does not overwhelm the eye with light when it is turned on.</p><p></p><p>2d focal plane reticle appears to remain the same size as the magnification is changed. On some scopes the mil spacing is correct at the max magnification and at 10x on others. Advantage on a 6.5-20x variable with the mil spacing correct at 10x, the reticle covers a smaller portion of a small long-range tgt with the scope magnification on 20x. Disadvantage is the mils can be referenced with the scope not precisely on the correct magnification, resulting in unsat results. With the IOR 2.5-10x the mil spacing is correct at 10x so there is no real advantage to having the reticle in the 2nd focal plane other than it is still easy to see in low light at the lowest magnification without requiring illum and it is just what Americans are accustomed to seeing in a variable magnification scope.</p><p></p><p>[ 10-13-2003: Message edited by: RuffHewn ]</p></blockquote><p></p>
[QUOTE="RuffHewn, post: 17020, member: 1358"] Sakofan, I agree with HBar. I had this exact decision to make, either the IOR 2.5-10x with illuminated MP8 reticle in the 1st plane or the non illum version with the MP8 in the 2nd plane. I went with the illuminated version only because it is in the 1st plane but have found other good reasons for having the illum reticle since. To answer your question: 1st focal plane reticle appears to enlarge, looking only at the reticle, as you increase the scope magnification. Advantage is it maintains it's size in relation to the tgt so that the mil marks can be referenced at any magnification. Disadvantage is at 2.5x the reticle is fairly thin and can be lost against a dark tgt in low light, but the illum feature prevents this. Also worth noting the is IOR illum scope does not have the heavy bars at the top of the horizontal stadia and the sides of the vertical stadia so it does not overwhelm the eye with light when it is turned on. 2d focal plane reticle appears to remain the same size as the magnification is changed. On some scopes the mil spacing is correct at the max magnification and at 10x on others. Advantage on a 6.5-20x variable with the mil spacing correct at 10x, the reticle covers a smaller portion of a small long-range tgt with the scope magnification on 20x. Disadvantage is the mils can be referenced with the scope not precisely on the correct magnification, resulting in unsat results. With the IOR 2.5-10x the mil spacing is correct at 10x so there is no real advantage to having the reticle in the 2nd focal plane other than it is still easy to see in low light at the lowest magnification without requiring illum and it is just what Americans are accustomed to seeing in a variable magnification scope. [ 10-13-2003: Message edited by: RuffHewn ] [/QUOTE]
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Advantages of "second focal plane?"
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