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Re: [OM] 50mmf1.8

Subject: Re: [OM] 50mmf1.8
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Wed, 16 May 2001 19:27:49 -0400
Olympus SCs tend to be yellow, and nothing but yellow.  All the MCs I've
seen have variations on blue, red, green and combinations there of.

John  Hermanson
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http://www.zuiko.com
Camtech, Olympus Service since 1977.
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----- Original Message -----
From: "Mark Hammons" <astaire@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Wednesday, May 16, 2001 1:44 PM
Subject: Re: [OM] 50mmf1.8


| Typically, A purple coating is indicative of single coating
| using magnesium flouride, which I think is the standard
| single-coating material.
|
| But when you look at reflections in MC lenses and see green, a little
magenta
| and other colors at different "levels" in the lens I think you are seeing
the
| reflections from all internal lens elements.  It may be that not ALL the
lens
| surfaces are multi-coated and that SOME are single coated Mag flouride and
that
| these lens elements will give you the purple reflections.  So I'm guessing
the
| multi-coated designation just means that AT LEAST ONE element is
multicoated,
| but not necessarilly all of them.
|
| Mark Hammons
|
|
| Alan
|
| I am not entirely sure, but a purple reflection should mean multi-coating
| as well. I have numerous olympus digital SLRs that I *know* are
| multi-coated and have the purple color to them when examined under light.
| This, however, may be different with Zuikos.
|
| Someone correct me if I'm wrong, because I don't want to go buy a purple
| lens thinking it's mc'd when it's not :)
|
|
| Chris
|
|
| At 05:40 AM 5/16/2001, you wrote:
|
| >Hum -- I have one 50mmf1.8 from around 1978/79 that has neither gold nor
green
| >reflection. Instead it is just purple. Purple Purple Purple. I thought
all
| >lenses by 1978 were MC? My 35f2 from 1981/2ish is marked MC.
| >
| >Alan
| >
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|
|
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|
|
|
|
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|
|


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