[Leica] Lenses

["Dr. Elliot Puritz" <drpuritz@bellsouth.net>]

I would be very interested in seeing what Erwin says about Leica glass being
obtained from different sources, and the coatings being modified  according
to the properties of the glass.  In his book Erwin is very clear about the
quality control that Leica uses in the manufacture of their lenses, and the
pains that they take to insure that the glass used is of such a nature as to
assure that the computer design of the lens is in fact what is achieved in
the final result.  If the glass is different from one "batch" of lenses to
another ( naturally of the same type, e.g., the 50 summilux for example )
then the final result might not be consistent.  Anyone going to Solms soon
for one of the Leica courses?  Would be a great question to ask at the
factory.

Elliot

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