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Re: [OM] changes in optical formula

Subject: Re: [OM] changes in optical formula
From: "Janis Wright" <jwright@xxxxxxxxxxxxxx>
Date: Tue, 29 Sep 1998 20:23:34 -0700
On 28 Sep 98, at 20:51, Winsor Crosby wrote:

> >You may not be able to narrow it down to one version, but knowledge of the
> >various markings can help, especially if there are only two versions. ie: An
> >early lens marked "E.ZUIKO" has five elements. But my 85/2 doesn't have
> >the letter code, nor the MC marking, so I'm not quite sure which version
> >it is,
> >or if it's MC or not. I thought I read that the E.ZUIKO code preceeded the
> >use
> >of "MC", and that a lens with neither of these markings would be newer yet,
> >and by definition, MC (multicoated). Or was this discussion only in reference
> >to the 50/1.8? I'm still not certain if my 85/2 is MC or not. (It's S/N
> >20563x)
> >Shawn & Janis Wright
> >swright@xxxxxxxxx
 
> 
> It is MC, but how many elements does it have? Hmm.
> 
> Winsor
> 
I assume you mean by this that you have a suitable specimen of this serial # 
range to compare with? I think you are right, but the coating is definitely 
different than my 50/1.8, and it also appears that at least one element may 
be SC in the 85/2:

85/2
Primary reflections: Pale green, purple, yellow.
Secondary reflections: Purple, yellow <- from SC element?

50/1.8
Primary and secondary: Blue, Purple, Yellow

35/2.8 and 135/3.5 both SC:
Purple, yellow.

But you're right about the elements: the 10/76 lens guide lists 6/4, while the 
current model is 5/4. It seems likely that the element change occurred when 
the coatings did, but who knows for sure...


Shawn & Janis Wright
swright@xxxxxxxxx
http://Zuiko.sls.bc.ca/~swright
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