Archived posting to the Leica Users Group, 1998/04/20

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Subject: Re: [Leica] M's and focusing
From: Eric Welch <ewelch@ponyexpress.net>
Date: Mon, 20 Apr 1998 11:03:19 -0500

At 10:38 AM 4/20/98 -0400, you wrote:

>If the distance from the lens to the person's eyes remains the same, the
>person's eyes should remain in focus if you are using a flat field lens (a
>lens with little or no curvature of field).  

Isn't the opposite the way it works? If you are the same distance at the
edge of the frame from the person's eye as you were when that eye was in
the center, than the subject has moved closer to the film plane.


Subject focused on ---------------------------------------------> Eye
|
|
|
|
|
some distance|
|
|
|
Camera  - looking directly at subject, eye off in the right corner of
viewfinder.

Flat field would imply if the subject in the center is still in focus, the
eye in the edge would be in focus. 
==========

Eric Welch
St. Joseph, MO
http://www.ponyexpress.net/~ewelch

Maintenance-free: When it breaks, it can't be fixed