Re: SMC again (was Re: Pentax AF 100 mm f3.5 micro)

[Alan Chan]

It could also be the result of rubbing and cleaning. Everytime when I used a 
product called "Opti-clean" to clean my coated lenses, the colour of the 
coating will return to its true colour (I guess).

regards,
Alan Chan

> > Don't lenses age over time, too?
> > Maybe what you are seeing is the
> > difference caused by the coatings
> > on the older lenses oxidising over time?

>I've not heard of coatings oxidizing.  However, I've purchased
>new M-series lenses within the last year or so, as well as
>having recently purchased new and used A-series lenses, and a
>new FA lens, and each series show differences in the the
>coatings.

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