Being in the optical business on a part time basis there are a lot of
confusing terms to some people when it comes to coatings. Here is a list of
the possible markings and what they mean:
1. Coated--At least one air-to-glass surface has at least one coat, usually
the outer surface.
2. Fully coated--All air-to-glass surfaces have at least one coat and one or
more surfaces
have only one coating layer.
3. Multi coated--At least one air-to-glass surface has a minimum of 2
coating layers, usually the outer one again.
4. Fully Multi coated--All air to glass surfaces have at least a 2 layer
coating.
Now above this you get proprietary names for various coating groups like the
7 layers of the original Pentax SMC.
And while this is the common goal in photo optics in some fields more
coatings can actually be a problem instead of a benefit.
Kent Gittings
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Raimo Korhonen
Sent: Monday, October 22, 2001 5:44 PM
To: [EMAIL PROTECTED]
Subject: Vs: Question on SMC filters
A multicoated filter does not reduce flare other than produced by the filter
itself.
Multicoated lenses are usually wholly multicoated so that also the internal
surfaces are multicoated - but all surfaces may not have the same number or
similar types of coatings. Actually the internal reflections are the most
detrimental to image quality but even a single coating reduces these
significantly. So you may like to test the Konica lens and see for yourself.
All the best!
Raimo
Personal photography homepage at
http://personal.inet.fi/private/raimo.korhonen
-----Alkuper�inen viesti-----
L�hett�j�: Robert Wetmore <[EMAIL PROTECTED]>
Vastaanottaja: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
P�iv�: 22. lokakuuta 2001 20:26
Aihe: Question on SMC filters
>Hello, all...let me ask a question which will display my ignorance of
>optical principles:
>
>Does mounting a multicoated filter actually reduce lens flare, or does it
>just minimize the flare that would have been added by the filter itself?
In
>other words, would adding an SMC filter improve performance on non-SMC
>lenses in regard to flare? (Only the outside element is multicoated on SMC
>glass, right - so does flare just come from rays striking the first glass
>surface?) Help; I'm confused.
>
>I ask because I am thinking of buying up some of the undervalued Konica
>glass out there (after great results from their 57/1.2) but, since I have
>been spoiled by the SMC of Pentax glass, I am wondering how much an SMC
>filter would help.
>
>Thanks,
>Rob
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