> My personal opinion is that this is a bunch of hooey. If you have an AR
> coated filter (even an old one) it should be coated on both sides.
My initial, uneducated reaction is to agree with you, and I have seen no
information to change it. The one thing that bothers me is that some filter
manufacturers might have been blowing off the back side as a cost savings
without sharing that fact.
I have always believed that all surfaces of modern (by that I mean since
multi coating) lenses have been coated. Older single coated lenses may or
may not have. A simple three or four element lens may profit less from
extensive coating.
Bill Pearce
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