Archived posting to the Leica Users Group, 2014/02/11

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Subject: [Leica] Lanthanide glass?
From: pdzwig at (Peter Dzwig)
Date: Tue, 11 Feb 2014 11:51:29 +0000


Knowing your expertise....

What is the issue with Lanthanum in lenses. I thought its use had been
discontinued long ago on health grounds, maybe in the 50s, although what the
details were I don't recall. Now someone else tells me otherwise.

...were there other compounds discontinued for similar reasons?


Dr Peter Dzwig                          

Replies: Reply from hlritter at (Howard Ritter) ([Leica] Lanthanide glass?)