On 8 May 2001, at 21:31, Gerald Cermak wrote:
> I once sneeze near my SMC Tak 85/1.8, and have never been able to get the
> dozen or so little spots off the coating (actually I think the SMC coatings
> morphed into some new compound in those spots). :(
>
> They aren't that durable.
I am sure that the SMC formulation has gone through some development and
revisions since its early days, I would suggest that its scratch resistance
would be one of the properties that was improved. In Leica literature that I
have read they often make mention of constant improvement to lens coatings
including improved scratch resistance.
So I would not disagree that the older Tak lenses may be able to scratch but
I wouldn't say that it would be entirely accurate to include recent lenses.
Some of my Pentax lenses have been through quite a bit of wear and tear
and are cleaned regularly, none have developed coating problems or
scratches. I did however have older Leica glass that had badly scratched
front elements, glass has also been refined over time and I assume has been
designed to offer greater scratch resistance of late.
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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