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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
40mm, 42mm, 44mm & 50mm Objective - Optical Question of the Year
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<blockquote data-quote="Mysticplayer" data-source="post: 19411" data-attributes="member: 8947"><p>I will throw in my 2 cents and agree with 700.</p><p></p><p>The image we see through the scope is a straightline reflection from the target (assume no atmosphere). How the target is lit will affect shadows and the air between the target and the obj of the scope. The target doesn't move.</p><p></p><p>The obj is still in a straight line however, the image reflection may be distorted/bent by the changes in atmosphere conditions.</p><p></p><p>So the change in POI is a function of the distortion of the reflection due to the changes in air - temp, wind, etc. If we shot in a vacuum, the POI would not change regardless of the position of the light source (assume that amount of light emitted is the same).</p><p></p><p>As to the amount of distortion vs obj size, the effect is very small and would contradict due to the differences in lense quality, number of lenses, coatings, internal finish, size and thickness of lenses.</p><p></p><p>You will not be able to qualify that one obj diameter is better then another. Too many other components play a part.</p><p></p><p>However, if you assume that our eye can only absorb so much light and the exit diameter of light from the scope is equal or larger then the pupil, then the quality of coatings will play a much larger effect then size of objective.</p><p></p><p>I have "small" obj scopes that work better in dim light then "big" obj scopes. Same diameter tube so let's assume same diameter erector lenses. The number, quality and coatings of the better "small" scope plays a more important role then size of objective lense.</p><p></p><p>confused???</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 19411, member: 8947"] I will throw in my 2 cents and agree with 700. The image we see through the scope is a straightline reflection from the target (assume no atmosphere). How the target is lit will affect shadows and the air between the target and the obj of the scope. The target doesn't move. The obj is still in a straight line however, the image reflection may be distorted/bent by the changes in atmosphere conditions. So the change in POI is a function of the distortion of the reflection due to the changes in air - temp, wind, etc. If we shot in a vacuum, the POI would not change regardless of the position of the light source (assume that amount of light emitted is the same). As to the amount of distortion vs obj size, the effect is very small and would contradict due to the differences in lense quality, number of lenses, coatings, internal finish, size and thickness of lenses. You will not be able to qualify that one obj diameter is better then another. Too many other components play a part. However, if you assume that our eye can only absorb so much light and the exit diameter of light from the scope is equal or larger then the pupil, then the quality of coatings will play a much larger effect then size of objective. I have "small" obj scopes that work better in dim light then "big" obj scopes. Same diameter tube so let's assume same diameter erector lenses. The number, quality and coatings of the better "small" scope plays a more important role then size of objective lense. confused??? Jerry [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
40mm, 42mm, 44mm & 50mm Objective - Optical Question of the Year
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