Archived posting to the Leica Users Group, 1999/06/17

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Subject: [Leica] Leica comments on lenses, in included notice.
From: Xavier Logean <xavier.logean@epfl.ch>
Date: Thu, 17 Jun 1999 16:04:14 +0200

Hi Luggers,

I just bought an M Elmar 50 2.8 (latest) and I was reading the Leica
instructions
and was surprised by the info that is given by leica:

".... performance remains unchanged even at close range, if the aperture
is slighly reduced"
"How much" is close range ?

"A S of the A coating procedure ensures neutral and natural colour
reproduction, which now equals that of the other Leica-M lenses. Even at
maximum aperture the lens performs extremely well and there are
virtually no colour fringes or aberrations due to field curvature. When
stopping down to mid-aperture, the low tendency towards coma disappears
entirely."
Do they mean that the old  elmar was not good compared with other
Lieca-M lenses ?

About vignetting:
" the decrease in light towards the edges of the picture becomes
particularly evident with low exposure and uniform, pale image field.
However, beyond ap. setting 5.6, the lens is free of vignetting and
provides flawless full field illumination. The ELMAR is virtually free
of distorsions and reflexions, even if there are light sources in the
picture."
Are all notices , let say "so  reallistic" ?,
It is strange compared to the "Faszination durch Praezision"  !?

Another thing was interesting, the notice on the use of filters:
"the use of filters is possible without limitations"
and in French "l'utilisation de filtres est deconseillee" which means
exaclty the opposite !
(the German text corresponds to the English text)
A simple mis-translation ?

I also own a summilux 35 asph and an elmar 90 (latest) but I don't have
the notice for both of them.
I would appreciate if somebody could forward me what Leica says in the
notice for those two lenses.
(by fax or e-mail or a scan pic)

regards,

Xavier.

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Logean Xavier                            e-mail: xavier.logean@epfl.ch
Swiss Federal Institute                  Phone : ++41 21 693 52 57
of Technology Lausanne  (EPFL)           Fax   : ++41 21 693 66 10
Computer Science Department (DI)
Institute for computer Communications and Applications (ICA)
CH-1015 Lausanne
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