On Thu, 6 Jan 2000, Olaf Greve wrote:
> Does anyone know why both the 35mm Shift and the 24mm Shift don't have auto
> diafragms?
>
> Is it perhaps the case that the diafragm itself is located in the part of
> the lens which gets shifted, hence somehow making it impossible to couple it
> to a diafragm lever in an automated way?!?
That would be a very good reason. The diaphragm linkage, which allows
the camera body's metering system to determine the extent to which the
lens will be stopped down for exposure, has a circular motion. The
shift is a linear motion. To get an auto diaphragm to work in a shift
lens, some mechanism would have to be devised which would give a
circular motion compensated with a linear motion - and my brain hurts
just trying to think about it!
--
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