[PlanetMan]

Originally Posted by LewisM

http://www.skyatnightmagazine.com/ne...igins-revealed



Ah fluorine... mix it with Calcium, and you have sweet, SWEET optics, and minty fresh breath.

I probably misread the article but it doesn't actually discuss fluorite in refractor optics - I thought the whole idea of fluorite particle lens (ie FPL 51 53) was to get the good benefits of fluorite crystal without the hiccups (fragile, brittle, expensive, toxic etc)