Archived posting to the Leica Users Group, 1999/08/10

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Subject: RE: [Leica] NEW Leica screw,,Really?
From: Marc James Small <msmall@roanoke.infi.net>
Date: Tue, 10 Aug 1999 17:30:30 -0400

At 08:15 PM 8/10/1999 GMT, Dan S wrote:
>A lens is designed to focus to infinity at a particular distance 
>fromt film plane.  You can always use spacers to move the lens out a bit, as 
>in the case of the LTM/M converter, but to go the other way would mean 
>moving the lens elements CLOSER to the film plane.  This would mean 
>re-designing the lens body to move the elements closer.

No, Dan.  It is a matter of shaving 1mm off the mounting surface.  The
provision of a thread-mount in place of an M bayonet already requires a
"complete redesign" of the mount, so the shaving of a 1mm distance is no
biggie.

Marc

msmall@roanoke.infi.net  FAX:  +540/343-7315
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