Don Baccus wrote:

> I doubt the Leica uses calcium fluorite elements. They don't in their camera
> telephoto optics. [snip]

For what it's worth, the Leica literature indicates that they do use
fluorite in the objective lens of their APO Televid scope -- in fact,
the APO Televid has two fluorite elements whereas Kowa (at least in the
old TSN 3/4) uses a single fluorite element.

David Wright
Miami, FL
wright at diana.barry.edu