Archived posting to the Leica Users Group, 1998/03/13

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Subject: Re: [Leica] Lens coating colour
From: "Jeff S" <segawa@netone.com>
Date: Fri, 13 Mar 1998 10:59:31 -0700
 
Believe it has to do with the thickness of the lens coating(s), and
evidently, one size does NOT fit all, as my new Elmar is reddish, not green.
Seem to recall hearing that Leica (and probably others) choose according to
what optimizes light transmission, and that indescriminate application of
multiple coatings can actually degrade performance.

Jeff
- -----Original Message-----
From: Neil Frankish <nfrnkish@dux4.tcd.ie>
>A question for the cognoscenti among you. The coating on the front element
>of my 50 summicron (latest) and 28 elmarit (latest) is red, but that on my
>new 90 elmarit is green. Why is there a difference?