Talk:Crown glass (optics)

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Fluorite

Fluorite (calcium fluoride) is otherwise used to make glass turbid, which is normally undesirable i optical glass. Is it used for other purposes too? The article on Abbe numbers indicates that it would lower the dispersion of crown-glass, but this needs confirmation. —Preceding unsigned comment added by 150.227.15.253 (talk) 13:15, 22 March 2010 (UTC)[reply]

It is used for some of the elements in expensive apochromatic lenses, which provide better correction of aberrations than the more common achromat lenses. I have used fluorite microscope objective lenses. See Fluoride glass for other applications. --Srleffler (talk) 04:19, 23 March 2010 (UTC)[reply]

The original crown glass

The article makes it obvious that the name "crown glass" originally referred to a very specific formula, and since then has been applied to other formulas with comparable performance. But there's no information on what the original formula is, who developed it, where or when, etc. TooManyFingers (talk) 18:33, 13 July 2021 (UTC)[reply]