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> Challenge is scaling out camera-sized crystals of Calcium and Fluoride with optical clarity is hard, which Canon has been trying for a few decades Not really
by ricardobeat 3y ago
> Challenge is scaling out camera-sized crystals of Calcium and Fluoride with optical clarity is hard, which Canon has been trying for a few decades
Not really an informative summary on that. They’ve been succeeding, not trying, for decades. The problem of growing the crystals was solved in the 60s and this is commonplace now.
Fluorite is also used in Fuji lenses, and Nikon/Sony have their own special glass to deal with the same problems.
- ubercore 3y agoYeah, according to the article, their first commercial lens with flourite was delivered in 1969.
- throwaway81523 3y agoI thought there was at one time an issue with the fluorite elements in those huge many-kilobuck lenses absorbing moisture from the air and cracking or having other sorts of failures. Canon for a while stayed with fluorite while Nikon worked out ED glass that avoided the problem. I don't know if today's Canon L lenses use fluorite.