Correct, Chuck.
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Chuck Norcutt
Sent: 19 July 2006 14:39
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Ghost from the past... New: OM with adapter (and chip?)
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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