Eric,
Given that we burn the corners in, does it really matter that the
lens isn't
sharp in the corners. All this corner sharpness is great hype from
the lens
companies, but in the darkroom we show them who is boss and burn the
corners. I couldn't care less about the corners. However, your point
that
wide open the lens isn't sharp strikes a nerve. What's happening where
things are important seems more vital than all unneeded concern about
the
corners.
Doug
On Dec 11, 2009, at 8:59 PM, Eric Goldstein wrote:
The uncoated Sonnar 50/1/5 is a great lens with great character, but
it is far from sharp wide open and away from the center.
Eric Goldstein
On Fri, Dec 11, 2009 at 8:49 PM, CarlosMFreaza <cmfreaza@xxxxxxxxx>
wrote:
2009/12/11 Stephen Attaway >
To quote from Ivor Matanle: "The portrait of Mr Robert Cox was
taken in
1974
to mark his fifty years of service to his company ... with a 50mm
f1.5
uncoated Zeiss Sonnar, and shows perfectly the curious
characteristic of
defined yet slightly unsharp detail that makes the optical quality
of
classic lenses so attractive."
I tend to disagree with Ivor Matanle, the uncoated Zeiss Sonnar
1.5/50
was designed to be a very sharp lens, in general lens designers look
for lenses to produce an image as close to the real image as
possible,
it means aberrations free, sharp and the best micro-contrast,
except
lenses for special purposes. It's true some old lenses produce
pleasant images thanks to some no well corrected aberrations (I
think
about portraits specially), but they couldn't be the standard to
obtain a good image.
This is a sample about a snapshot "portrait" taken with the uncoated
Contax II Sonnar 1.5/50 _wide open_ f1.5 and 1/1250 sec shutter
speed
, I think the in focus areas show very good detail for a 71 years
old
uncoated lens despite a scanner not so good for 35mm :
http://www.flickr.com/photos/itarfoto/3199809044/
Carlos
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