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Message: <blockquote data-quote="denco@comcast.n" data-source="post: 3365949" data-attributes="member: 25300">BobIt is a simple truth that a wide FOV ocular is more expensive to make. Think Nagler in the telescope world. That is a big reason the Maven's are cheaper. The Maven's also do use a Magnesium frame like the Ultravids. Maybe it is a cheaper grade and that is why they are so heavy.:king: With modern ED glass SP prisms transmitting at 99% there is hardly no advantage to an AK prism now days. As quoted by Kabsetz from Holger:KabsetzThursday 2nd April 2015, 02:13"Like Holger says, the possible image quality improvements offered by A-K prisms over S-P prisms are very slight even theoretically, in an optimal optical execution. In practice, none of even the very best binocular models by the very best manufacturers are built to tight enough tolerances that the benefits of the A-K prisms would ever be visible, as they would be hidden under spherical aberration, coma, astigmatism and chromatic aberration that the manufacturers allow to remain in the binocular image to varying degrees since they maintain that it does not matter. The only advantage that the A-K prisms have that could be visible in real-life commercially available binoculars under some conditions and to very critical observers is the up to 3% advantage in light throughput, but even that is so minimal that it hardly matters, and would play second fiddle to almost any individual sample variation differences in the actual binoculars being compared."<a href="http://mavenbuilt.com/optics/" target="_blank">http://mavenbuilt.com/optics/</a></blockquote>

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