Archived posting to the Leica Users Group, 2002/01/12

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Subject: [Leica] RE: NEW M7 MAJOR CROCK-POT CROW PARMESAN
From: Jim Brick <jim@brick.org>
Date: Sat, 12 Jan 2002 17:37:38 -0800
References: <3C40B5E6.BE4F89AD@markrabiner.com>

At 03:22 PM 1/12/2002 -0800, Frank Filippone wrote:

>This could be done with a Copal between the lens shutter.. remember the
>Leica Compur?  IN fact that is a darned good idea.. put a BTL shutter in the
>camera instead of a focal plane shutter.....I like it!


Gee... vignetting with all lenses, not just wide angle lenses. Sort of like 
automatically dodging the corners of your picture.

The reason BTL shutters work so well is that the good ones are exactly at 
the focal axis (or whatever it is called) where the rays cross, and the 
diaphragm is.

There are leaf shutters that operate outside the lens, but they also 
produce artifacts from this very arrangement. Things like Packard shutters 
are for time exposures only and thus eliminating corner fall off.

Jim

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In reply to: Message from Mark Rabiner <mark@markrabiner.com> ([Leica] NEW M7 MAJOR CROCK-POT CROW PARMESAN)