>I just realised that the Oly auto extension tubes I have dont have any
>coating either. ;-)
In fact, the glass is of a Oxygon-Nitrogen-Helium formulation that has a
perfect 1:1 interface with the air so it does not require coatings.
Fortunately, these lenses are pretty resiliant to fungus and fingerprints.
Just got to watch for the occasional spider.
Ken
Kenneth E. Norton
Image66 Photography, Broadcast Consulting and Audio Engineering
image66@xxxxxxx
(515) 791-2306
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