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Message: <blockquote data-quote="denco@comcast.n" data-source="post: 3665735" data-attributes="member: 25300">My point is the type glass used in a binocular be it fluoride or HT has a significant effect on transmission. No doubt the AK prisms in the HT helped transmission but Zeiss claims the new Shott High Transmission Glass also played a big part in the 95% transmission. From Zeiss and Schott and a video from Tract on why they use Schott HT glass in their rifle scopes."The revolutionary light transmission of 95% and more enables hunting deep into the night. This unique experience is the result of an innovative optical design. It is the combination of extremely transparent SCHOTT HT high transmission lens elements and the enhanced ZEISS T* multi-coating."Take the example of Zeiss optics: in their search for a better microscope, the team at SCHOTT glass came across the process to make glass that got 3% better light transmission than before. The result was HT (High Transmission) glass, which now is at the centerpiece of their new Victory binoculars and riflescopes."As part of its extensive portfolio of optical glass types, SCHOTT has been offering special glass variants that are known for their superior transmittance. These special  glass types with significantly improved transmittance, all being identified with the suffix "HT" or "HTultra", are especially suitable for digital projection and high end optical systems.<a href="https://www.tractoptics.com/videos/riflescopes/why-weve-used-schott-ht-glass" target="_blank">https://www.tractoptics.com/videos/riflescopes/why-weve-used-schott-ht-glass</a></blockquote>

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