I meant to mention that the 24mm shift lens (and I presume the 35 shift
as well) is described as having a manual aperture but it meets the
definition I gave of a "pre-set" lens. Setting the aperture ring
doesn't actually change the aperture. You do that by pressing a toggle
button. Press once to close, again to open. Or at least that's the way
I remember it. I don't have one anymore.
Chuck Norcutt
Chuck Norcutt wrote:
>
> I think Pentax claims the first fully automatic diaphragm in a
> production camera in 1960. Prior to that photographers had to use
> manual stop-down methods. Some lenses had what were called "pre-set"
> diaphragms. You could set the aperture but the lens wouldn't actually
> stop-down until you pushed the stop-down button or turned a lever. The
> advantage was that, if you pre-set the aperture, you could do the actual
> stop-down for the exposure very quickly without checking the setting on
> the aperture ring.
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