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Hunting
Long Range Hunting & Shooting
Is 20x enough scope for 500 yards?
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<blockquote data-quote="bruce_ventura" data-source="post: 638728" data-attributes="member: 34084"><p>Using a rifle scope for resolving target details (like the number of points) at long range is difficult at best. A spotting scope usually has the advantage of larger objective, higher magnification, less glare, and intrinsically higher resolution due to lower off-axis aberrations. If you need to save the weight or time and use the rifle scope to see details, your will need a properly mounted scope and intrinsically good optical performance.</p><p></p><p>Most long range rigs are set up with insufficient cant or elevation bias in the base. The elevation adjustment is then cranked up to 25-50 MOA to get the correct point of aim for a long range shot. Even in the center of the erector field of view, the objective is off-axis, which degrades the resolution due to optical aberrations (image blur). </p><p></p><p>If you want to play that game, you should reduce the elevation adjustment, which means increasing the base offset angle. Keeping the elevation adjustment below 20 MOA is usually sufficient to minimize off-axis aberrations. That may result in a large elevation adjustment in the opposite direction to get an accurate point of aim at 100 yds. That's ok because it's a short range shot where resolution isn't needed. </p><p></p><p>Using good glass to begin with also helps a lot. The better the optics, the better the "correction" of these aberrations will be in the optical design. In this case good usually glass means three lenses in the objective, instead of just two, and a properly optimized optical design, which takes experience.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 638728, member: 34084"] Using a rifle scope for resolving target details (like the number of points) at long range is difficult at best. A spotting scope usually has the advantage of larger objective, higher magnification, less glare, and intrinsically higher resolution due to lower off-axis aberrations. If you need to save the weight or time and use the rifle scope to see details, your will need a properly mounted scope and intrinsically good optical performance. Most long range rigs are set up with insufficient cant or elevation bias in the base. The elevation adjustment is then cranked up to 25-50 MOA to get the correct point of aim for a long range shot. Even in the center of the erector field of view, the objective is off-axis, which degrades the resolution due to optical aberrations (image blur). If you want to play that game, you should reduce the elevation adjustment, which means increasing the base offset angle. Keeping the elevation adjustment below 20 MOA is usually sufficient to minimize off-axis aberrations. That may result in a large elevation adjustment in the opposite direction to get an accurate point of aim at 100 yds. That's ok because it's a short range shot where resolution isn't needed. Using good glass to begin with also helps a lot. The better the optics, the better the "correction" of these aberrations will be in the optical design. In this case good usually glass means three lenses in the objective, instead of just two, and a properly optimized optical design, which takes experience. [/QUOTE]
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Is 20x enough scope for 500 yards?
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