Archived posting to the Leica Users Group, 2001/09/16

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Subject: Re: [Leica] PC Super Angulon-R 28mm/Chromatic Aberration?
From: "Don Dory" <dorysrus@mindspring.com>
Date: Sun, 16 Sep 2001 10:46:53 -0400
References: <200109160701.AAA01029@mejac.palo-alto.ca.us> <015401c13ebc$05b27600$bce07d80@KRIEGERLPT>

If the grain is mushy on that size print then either your focus was off, the
enlarger moved, or the enlarger lens was not so good.  Regarding the
chromatic aberration, if it increases as you move to the edges of the frame
then it is your SA.  In any event it is probably your SA unless you have an
extremely poor enlarging lens.  However, see if you can borrow another
enlarging lens from a store or an individual as even "name" manufacturers
can make a clinker.  You won't even have to make a print, just use your
grain focuser to look in the corners of the image, if it is the enlarging
lens then any neg you use will fringe. In fact, you should check a neg from
a 35-85 focal length with your lens as if it is the enlarging lens then the
fringing will be there.

Don
dorysrus@mindspring.com

In reply to: Message from "Martin Krieger" <krieger@usc.edu> ([Leica] PC Super Angulon-R 28mm/Chromatic Aberration?)