Sylwester Pietrzyk wrote:
> On 04.10.2006, at 12:56 , Shel Belinkoff wrote:
> 
>> Lots of companies use Hoya glass, even Leica.  I'm sure Pentax is  
>> using
>> Hoya glass where appropriate.
> But SMC is Pentax own, isn't it? ;-)

"SMC" was revolutionary 30-odd years ago, but these days anyone with the 
right software and a basic understanding of optics can design high 
performance multi-layer optical coatings.  SMC is just a brand.

http://www.thinfilmcenter.com/

S


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