[pure-silver] Re: Advice on an 150mm enlarging lens.
- From: Martin Jangowski <martin@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 13 Feb 2012 06:45:50 +0100
Am 13.02.2012 00:20, schrieb Bogdan Karasek:
Hello,
Since most of the group use enlargers and hence, have some
knowledgeable about enlarger lenses., I come seeking your advice.
I shoot B+W , and been shooting 4x5 for the past 2 years, but more and
more now. 35mm seems like a submiature. Right now, I use an Omega
D2v and a SK Componon 135/5.6 and a SK Xenar 150/4.5.
A SK Componon 150/5.6 is available. Should I get the Componon 150
to replace the Xenar? The 150 is the one I use more often than the
135, so it would be my principle lens in that format.
A few years ago, I made a test with my Durst G139 and CLS1000 color
head. I got an old enlarger with a chrome Componar 5.6/150 (SK tessar
type enlarger lens) and decided to compare the lens with my Schneider
Apo Componon HM 4/150. Using a sharp negative, I enlarged it to 40x50cm
and compared the center and the edges with a Peak grain enlarger, both
lenses stopped down two stops (f8 for the Apo and f11 for the Componar).
Then I made two identical enlargements (no big deal with my RHD Analyzer).
To make it short: with the Peak, you'll see no difference at all from
the center to about 2/3 to the edges. The edges show more curvature of
field with the Componar. After adjusting the focus accordingly (perfect
sharpness at about 1/2 from the center with slightly less sharpness in
the center and the edges), I made the enlargements and showed them at a
meeting with fellow B&W-photographers. No one was able to identify the
Apo-enlargement in real life.... they are subtile different, but not
really "better" or "worse".
No, I won't part with the Apo-Componon. I know that the (Apo, -S)
Componon are better with very large or small enlargements. So I would
get the Componon and forget about "better" enlargement lenses, it will
be plenty good enough for everything.
Martin
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