The 75 and 90mm lenses have both been used for SLR and RF designs. They're
telephoto designs.
All the cosina SLR lenses have full auto-aperture diaphrams.
The other lenses are mostly non-retrofocus, except for this new 40/2, so
they don't go on SLR's. I don't know about the 35mm designs but they have
two slower 35mm lenses that are housed in very different barrels, but are
basically the same designs. The 35/1.7 Ultron is quite a fast lens and
compares with the 35/1.4 Summilux Asph in size.
Skip
----Original Message Follows----
From: Winsor Crosby <wincros@xxxxxxxxxxxxx>
Reply-To: olympus@xxxxxxxxxxxxxxx
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] New Cosina 40/2 for OM!
Date: Fri, 19 Apr 2002 19:10:39 -0700
Looking at the lenses on the site is interesting. I was wondering how they
could say that the same lens is available for the Voigtländer rangefinder
and in mounts for various SLRs. My first question was whether the lens for
SLRs had automatic aperture which I was not really able to find. Second
question that occurred to me is that lenses for SLRs and rangefinders are
usually designed differently, especially in shorter focal lengths. Lens
elements can recess into a rangefinder body, but can't recess into an SLR
because of the mirror. Advantages in sharpness, contrast and correction are
usually cited by rangefinder makers because their lenses do not have be made
into a retrofocus design which requires extra elements and lens maker
gymnastics to achieve. Looking at the picture of the 35 mm lens for the
rangefinder it seems amazingly long - nothing at all like the comparatively
flat Leica 35mm. I wonder whether Cosina when planning their lens line
decided to design them all as retrofocus regardless of their application so
that a longer lens barrel could just be substituted on the rangefinder.
Have they really designed SLR lenses, ignoring the advantages of
non-retrofocus design, and just adapted them to a rangefinder rather than
the other way around?
--
Winsor Crosby
Long Beach, California
?
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