Archived posting to the Leica Users Group, 2000/02/28

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Subject: Re: [Leica] Re: APO for B & W??
From: Christer Almqvist <christer@almqvist.net>
Date: Mon, 28 Feb 2000 22:41:22 +0100
 
>Doug's response is consistent with my understanding.  Poor correction of
>chromatic aberrations leads to color fringing.  It can be even worse in B&W
>than color because the white light coming through the negative contains all
>colors of the spectrum, whereas the color neg or slide filters some of the
>colors out, so the fringing is less noticeable.  On B&W the "color fringing"
>bears out as unsharpness or loss of acutance, rather than seeing the colors
>in the color firinging.
>
>Tom Schofield
>
Is this true for enlarger with multigrade filters above the negative?