[rollei_list] Re: OT: Enlarging Lenses
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 1 Jan 2013 09:17:51 -0800
----- Original Message -----
From: "J M N" <retinaiiic@xxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, January 01, 2013 7:42 AM
Subject: [rollei_list] OT: Enlarging Lenses
It seems to me that I once read when making photo
enlargements Ansel Adams recommended a slightly larger than
normal focal length enlarging lenses. I can't find my notes
or any references to verify this. Can anyone concur or
disagree with this concept?
The longer lens will have less fall off of illumination
at the margins. Enlarging lenses are designed to have
optimum sharpness over a small range of magnification so a
longer lens may be somewhat out of its "optimum" range but,
except for extremely critical work. I don't think this is of
much significance.
As an example of the fall off problem I use a 135mm
lens for 4x5 because of the limited support height of my
enlarger. I have made it a routine to burn in the corners
of prints made from whole negatives a little to keep them
from going light. If I had the room I would prefer to use a
5x7 lens, say 210mm for 4x5.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@xxxxxxxxxxxxx
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