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Long Range Hunting & Shooting
30MOA base + 28" barrel = reduced image quality?
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<blockquote data-quote="westcliffe01" data-source="post: 913875" data-attributes="member: 35183"><p>Something odd about this situation... 30 min is only half a degree. Scope to barrel c/line should be about 1.5" if not more. The vertical displacement of the optical centerline over 28" is only a 1/4". So if we start with a c/line distance of 1.5" then deduct half the barrel diameter we are at 1" then deduct the 1/4" from the tilt we are at 3/4" from edge of the muzzle to c/line of optical image. Working backwards, 3/4 over 28" is an angle of 1.534 deg.</p><p></p><p>Looking at the scope specs, at min magnification the FOV is 12.2ft at 100 yards. The half angle of that is 1.165 deg. Since 1.165 is less than 1.534 deg, it means that the barrel should be out of the field of view at Min magnification. Obviously, as the magnification increases, the FOV reduces, which should take the muzzle further and further from the FOV.</p><p></p><p>So here is what I think. I don't think you have line of sight to the muzzle itself. I think the barrel is reflecting incident light into the ocular and that is what you are seeing. Given that this is a scope with a very narrow field of view, you should get a substantial improvement from using a lens shade. Worst case scenario, you may need to do something to cut reflection from the barrel. You might initially try a strip of black electrical tape on the top of the barrel on the full length. If this substantially improves the image, then the best thing you can do is figure a way to blacken the barrel. But a long lens shade should substantially improve the image and cutting reflection off the barrel would be the ultimate to solve this issue.</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 913875, member: 35183"] Something odd about this situation... 30 min is only half a degree. Scope to barrel c/line should be about 1.5" if not more. The vertical displacement of the optical centerline over 28" is only a 1/4". So if we start with a c/line distance of 1.5" then deduct half the barrel diameter we are at 1" then deduct the 1/4" from the tilt we are at 3/4" from edge of the muzzle to c/line of optical image. Working backwards, 3/4 over 28" is an angle of 1.534 deg. Looking at the scope specs, at min magnification the FOV is 12.2ft at 100 yards. The half angle of that is 1.165 deg. Since 1.165 is less than 1.534 deg, it means that the barrel should be out of the field of view at Min magnification. Obviously, as the magnification increases, the FOV reduces, which should take the muzzle further and further from the FOV. So here is what I think. I don't think you have line of sight to the muzzle itself. I think the barrel is reflecting incident light into the ocular and that is what you are seeing. Given that this is a scope with a very narrow field of view, you should get a substantial improvement from using a lens shade. Worst case scenario, you may need to do something to cut reflection from the barrel. You might initially try a strip of black electrical tape on the top of the barrel on the full length. If this substantially improves the image, then the best thing you can do is figure a way to blacken the barrel. But a long lens shade should substantially improve the image and cutting reflection off the barrel would be the ultimate to solve this issue. [/QUOTE]
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30MOA base + 28" barrel = reduced image quality?
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