>The original Cosina as well as Vivitar and Phoenix are also
>multicoated. But that brings up a question. How much of difference
>is there between Pentax SMC and multicoating on other modern lenses?
>The original SMC patent must have expired by now and anyone is free
>to use it. And anyway many manufacturers like Nikon and Zeiss
>licensed it back in the 70's. Pentax claims that SMC reduces loss
>of light transmission to 0.2%-0.3% compared to 5% for non-coated and
>2% for single-coated lenses . How does multicoating on non-Pentax
>lenses perform?
>
>Of course this is more critical on complex zoom lenses than would be
>on this 5 element lens.
I can tell you that Nikon's coating isn't as good as Pentax SMC, yet. I had
some Nikkor AF just few years back and they had flare problem which my
Pentax 20 yrs old SMC lenses do not. Even their high end 80-200/2.8 had
quite a lot of flare when pointing to the light source.
regards,
Alan Chan
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