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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope lab test
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<blockquote data-quote="Mysticplayer" data-source="post: 20548" data-attributes="member: 8947"><p>Without knowing what they measured and how, the twilight factor is not relevant.</p><p></p><p>Many scope and binocular manufacturers use a twilight factor that is a mathematical measure of objective lense ratio to magnification. Basically, a worthless measurement as any optic with the same obj and mag has the same twilight factor. </p><p></p><p>Doesn't take into account coatings, lense quality, etc. Unless you can say for sure, that may be where this is coming from.</p><p></p><p>Light transmission is a measure of all wavelengths in normal 'white' light. With the right meter, you are comparing the difference between entry and exit light.</p><p></p><p>If an optical device has near 100% light transmission, it will have better low light performance then an optical device with lower light transmission. We don't see in the infra red, so that is of little interest.</p><p></p><p>Look at the S&B Zenith. Rated with a 7 for light transmission (assume that is measured) but a 9 for twilight factor. My guess is this is a large objective scope. </p><p></p><p>The burris has a 10 for light tranmission but only a 7 for twilight factor. Doesn't make any sense.</p><p></p><p>The only results that have any value to me are the resolution (how you measure that is beyond me), anti-reflection (assume a measure of flare), and light tranmission. </p><p></p><p>Colour and contrast don't really matter as we are not 'glassing' with a scope and really don't care of our deer looks perfectly grey brown or just brown. We just need to be able to see it.</p><p></p><p>The twilight factor is probably not a measured rating so subjective thus worthless.</p><p></p><p>The overall test result is also worthless without knowing what else was being tested and how they were weighted in the final result.</p><p></p><p>Without the test parameters, levels of error and methodology of the tests, we could be still reading a subjective study of products most likey to sell in someone's store.</p><p></p><p>Sorry, to come across as a poison pill but I feel that any review or comparison posted here should give all reading accurate info.</p><p></p><p>I am glad that the Burris rated higher then just about all the scopes in light transmission and resolution. Goes to show that you don't need to spend enormous amounts of funds to get a good quality product.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 20548, member: 8947"] Without knowing what they measured and how, the twilight factor is not relevant. Many scope and binocular manufacturers use a twilight factor that is a mathematical measure of objective lense ratio to magnification. Basically, a worthless measurement as any optic with the same obj and mag has the same twilight factor. Doesn't take into account coatings, lense quality, etc. Unless you can say for sure, that may be where this is coming from. Light transmission is a measure of all wavelengths in normal 'white' light. With the right meter, you are comparing the difference between entry and exit light. If an optical device has near 100% light transmission, it will have better low light performance then an optical device with lower light transmission. We don't see in the infra red, so that is of little interest. Look at the S&B Zenith. Rated with a 7 for light transmission (assume that is measured) but a 9 for twilight factor. My guess is this is a large objective scope. The burris has a 10 for light tranmission but only a 7 for twilight factor. Doesn't make any sense. The only results that have any value to me are the resolution (how you measure that is beyond me), anti-reflection (assume a measure of flare), and light tranmission. Colour and contrast don't really matter as we are not 'glassing' with a scope and really don't care of our deer looks perfectly grey brown or just brown. We just need to be able to see it. The twilight factor is probably not a measured rating so subjective thus worthless. The overall test result is also worthless without knowing what else was being tested and how they were weighted in the final result. Without the test parameters, levels of error and methodology of the tests, we could be still reading a subjective study of products most likey to sell in someone's store. Sorry, to come across as a poison pill but I feel that any review or comparison posted here should give all reading accurate info. I am glad that the Burris rated higher then just about all the scopes in light transmission and resolution. Goes to show that you don't need to spend enormous amounts of funds to get a good quality product. Jerry [/QUOTE]
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