Archived posting to the Leica Users Group, 2000/11/25

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Subject: Re: [Leica] Jupiter 9
From: Stanley E Yoder <syoder+@ANDREW.CMU.EDU>
Date: Sat, 25 Nov 2000 08:39:16 -0500 (EST)
References: <200011250801.AAA17710@mejac.palo-alto.ca.us>

Excerpts from mail: 25-Nov-100 [Leica] Leica Users digest .. by Leica
Users digest@mejac 
> But the blue (really blue) treatment of the lenses gives yellowish colors,
[snip]

How can this be? *IF* (if) the coating color is actually affecting color
balance on the film (not usually), then, like a blue filter, a bluish
coating would cause bluish results, not yellowish.

I have two 50s-era Jupiter-9s, LTM and CRF, both of which have very
magenta coatings, and neither of which affects the balance.

OTOH, there are the early Thorium Summicrons, whose glass (not coating)
leads to a warmer image vis-a-vis other optics.

Puzzled in Pittsburgh,
Stan Yoder