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  1. D

    Real calcium fluorite in NL binoculars?

    This explains the difference in Kowa Prominar Fluorite and XD lenses and which binoculars they are used in. I have had the Kowa Prominar Genesis XD 8x33 binoculars and their CA control is among the best I have ever seen. https://sportingoptics.kowa-usa.com/content/15-optical-technology
  2. D

    Real calcium fluorite in NL binoculars?

    Just the big 82mm Kowa uses pure Fluorite. I don't know of any regular sized birding binocular that uses pure Fluorite lenses. https://sportingoptics.kowa-usa.com/high-lander-series/1250-high-lander-32x82mm-fluorite-binoculars.html