Archived posting to the Leica Users Group, 1998/12/26

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Subject: Re: [Leica] The 3D Efect
From: "Joe Stephenson" <joeleica@email.msn.com>
Date: Sat, 26 Dec 1998 13:50:51 -0700

George,
What you say it partially true.  The fact is Rangefinder use 3
focusing points and create what is called "tunneling." You set the focusing
points to achieve a perspective of an image when in focus.  The older
M-lenses where also designed with this in mind.  Some refer to it as a "3-D
effect" others refer to it as "rounding."  Call it what you like, but it is
the effect of the Rangefinder versus an SLR.
Peter K
++++++++++++
Dear Peter,
Could you please explain further what you mean by "tunneling" and "three
focusing points?" I sometimes observe a "3-D effect with Leica lenses
(others, too), but I have always thought it had to do with lighting, and
other details like DOF, contrast, etc.
Thanks,
Joe Stephenson