Archived posting to the Leica Users Group, 1997/05/16

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Subject: Re: 90mm Summicron Question
From: Stephen <cameras@jetlink.net>
Date: Fri, 16 May 1997 12:15:24 -0700

Gerard Captijn wrote:
> 

> The 90mmf/4 Rokkor was a lens produced by Leitz Wetzlar. Although its
> optical construction was identical to todays Elmarit-M, its performance is
> comparable to the   Tele-Elmarit-M.
> 

The 90/4 Rokkor M for the CLE is a different lens than the 90/4 for the
CL.  While both are 4 element and similar, the diagrams which I have
seem to show slightly different formulas through different element
curvatures.  The differences which I am aware of are as follows:
			90/4 Elmar for CL	90/4 M Rokkor for CLE

manufacture 			Germany			"Made in Japan"
cam				sharp curve		standard M cam
filters				Series 5.5		40.5
coating				single			multi
lable				Elmar C			"M-Rokkor"


Stephen Gandy