Archived posting to the Leica Users Group, 2005/02/12

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Subject: [Leica] A question about lens focus
From: abridge at gmail.com (Adam Bridge)
Date: Sat Feb 12 21:57:16 2005

When a lens is focused at, for purposes of example, 3 meters, is the
focus for a plane that runs perpendicular to the centerline of the
lens measured from some point (like the film plane) or is it a
spherical surface measured in the same way?

In my head I can make this work either way but I would like to know
how it really works.

Thanks

Adam

Replies: Reply from ericm at pobox.com (Eric) ([Leica] Re: A question about lens focus)
Reply from jdos2 at mindspring.com (Jeff Sumner) ([Leica] A question about lens focus)