Archived posting to the Leica Users Group, 1997/02/12

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Subject: Re: Coating on 90mm Elmarit
From: "Frank Filippone" <red735i@worldnet.att.net>
Date: Wed, 12 Feb 1997 21:27:38 -0800
 
> The color of the coating tells us little except as an indicator of what
> chemicals were used in the compound. 

I was told that the color of the coating is an indicator of film thickness.
 My optical wavelengths theory is a bit stale.  Did I misunderstand?