Archived posting to the Leica Users Group, 2000/02/20

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Subject: Re: [Leica] Heliar 15 comments/ film spacing
From: Ken Iisaka <kiisaka@pacbell.net>
Date: Sun, 20 Feb 2000 12:42:46 -0800

> This seems bizarre to me... it's not the lens but the film gate that
> determines the shape of the negative, isn't it?

Yes, but the film gate is located slightly in front of the film plane.
So, depending on the position of the exit pupil, the image area may
vary.  I can confirm that frames nearly touch each other when using my
Cosina 15mm, while they give a spacing of 2mm when used with other
lenses that I have.