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Scope for 1000+
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<blockquote data-quote="RonS" data-source="post: 1055037" data-attributes="member: 68613"><p>Do you work for Leupold? I have not had the same experience you have had. When it comes to brightness, it is a very objective measurement. The exit pupil diameter is the limiting factor. The exit pupil diameter is calculated by dividing focal length of the optic into the focal ratio. Given an exit pupil diameter, most decent quality glass and coatings will transfer 93% or more of the photons striking the objective lens. The more transferred, the brighter the scope. A flourite doublet APO for example may transfer 97% or more. A high end Valdata for example. An ED APO triplet may transfer 95% or more. A Nightforce or a high end Ziess for example. In both of those we are talking about a lot more money than we are for the Leupold's or the Vortex's or the Sightron's. They are better than cheap flint glass, they are fully multi-coated using quality coatings and you don't get a lot of fringing in any of them in high contrast conditions but you do get some. Now if you are seeing a brighter image through a Leupold than a Vortex or a Sightron then you are not comparing apples to apples. Perhaps the Leupold is lower power or has a larger objective or a different tube diameter but something is different. There are no freebee's in optics and there is no magic. You get what you pay for.</p></blockquote><p></p>
[QUOTE="RonS, post: 1055037, member: 68613"] Do you work for Leupold? I have not had the same experience you have had. When it comes to brightness, it is a very objective measurement. The exit pupil diameter is the limiting factor. The exit pupil diameter is calculated by dividing focal length of the optic into the focal ratio. Given an exit pupil diameter, most decent quality glass and coatings will transfer 93% or more of the photons striking the objective lens. The more transferred, the brighter the scope. A flourite doublet APO for example may transfer 97% or more. A high end Valdata for example. An ED APO triplet may transfer 95% or more. A Nightforce or a high end Ziess for example. In both of those we are talking about a lot more money than we are for the Leupold's or the Vortex's or the Sightron's. They are better than cheap flint glass, they are fully multi-coated using quality coatings and you don't get a lot of fringing in any of them in high contrast conditions but you do get some. Now if you are seeing a brighter image through a Leupold than a Vortex or a Sightron then you are not comparing apples to apples. Perhaps the Leupold is lower power or has a larger objective or a different tube diameter but something is different. There are no freebee's in optics and there is no magic. You get what you pay for. [/QUOTE]
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