Archived posting to the Leica Users Group, 1998/11/24
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Nigel,
>>Were they his lenses?<<
Relative to Ernst Hartmann cleaning lenses! No &
they were not mine either ! You have a point ;-)!
However, Jim's main point is still quite accurate;
Leica glass ( front element ) is well coated & can take
a lot of abuse. Filters do degrade apo performance!
Tom D.