Think about it, William. A 20 mm lens for a Leica rangefinder and a
20 mm lens for a Leica reflex. The body of the rangefinder is much
thinner because there is no mirror box and the rear element of its
20mm goes through the lens mount into the body to get even closer to
the film. Same focal length and same format. One is much farther from
the film plane and the light rays from the rear element have to be
more parallel from the more distant lens.
Winsor
Long Beach, California, USA
On Sep 5, 2006, at 4:16 AM, William Sommerwerck wrote:
> I've never bought this, since the angle at which the rays strike
> the film or sensor is determined by the lens's focal length, and
> nothing else -- as far as I can tell. How can you change that angle
> without changing the focal length?
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