Archived posting to the Leica Users Group, 2003/10/30

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Subject: RE: [Leica] CV nokton contrast and bokeh
From: "Don Dory" <dorysrus@mindspring.com>
Date: Thu, 30 Oct 2003 18:29:07 -0500

Rafael,
As it appears to be daylight on Tri-X I assume that you were somewhere
in the middle aperture range.  This is not really a good test for a fast
lens as only a real dog of a lens won't deliver in the middle.  Also,
the true test of a really superb lens is how it handles really fine
detail, what it does in veiling flare situation, and last how much field
curvature the lens exhibits.

One of the advances of newer designs over fast lenses from earlier times
is the use of aspheric elements to flatten the field, bring up edge
sharpness, and reduce vignetting.  I suspect that wide open the Nokton
will show a fairly even sharpness out to the outer zones with relatively
low vignetting.

As to the DR, it is quite simply superb from 2.8.  At F2 the edges of
the frame are not crisp and flare is something that you have to plan
around.  Also, by modern standards the contrast it exhibits is somewhat
flat.  Many people who test the DR haven't had it CLA'd and so get
results that do not reflect the true abilities of the design.

One of the things that sadden me about the rush into digital is the loss
of all the older lenses and their unique fingerprints.  In the M system
you can reach back almost the proverbial four score years for
interesting effects on film.

Don
dorysrus@mindspring.com

- -----Original Message-----
From: owner-leica-users@mejac.palo-alto.ca.us
[mailto:owner-leica-users@mejac.palo-alto.ca.us] On Behalf Of Rafael
Alday
Sent: Thursday, October 30, 2003 12:16 PM
To: leica-users@mejac.palo-alto.ca.us
Subject: [Leica] CV nokton contrast and bokeh

I have been using Nokton for a year and I have to say that this lens
produces in me a dual feeling.
I have not done any wonderful theoretical and optic test but i would
want to
tell my experiences.
Sometimes (probably and middle apertures) the pictures are sharp and
contrasted but in other conditions the lens is a litlle bit soft.
This picture is an example:
http://www.photo.net/photodb/photo?photo_id=1868446&size=lg

Low contrast (to me), good sharpness (to me) and nice bokeh (to me).
Gray
tones are nice (to me).

Is it comparable to DR summicron pictures. Excuse my ignorance.

Any opinions will be wellcome,
Rafael


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