You maybe want to search out an OM T-mount, or better a 7mm extension tube,
Curt. NB *not* an Auto Extension tube.
The manual tubes, and manual lenses, incorporate a fixed aperture lever in
the same position as the aperture reporting lever on an auto tube/lens.
Whatever the manual lens, that lever is fixed in the same position, which
tells the OM body tha the lens is set at its maximum aperture (whether it is
f/1.2 or f/11). Assuming your pin-hole lens provides a full frame coverage,
that will set the appropriate bench mark for the metering system.
On an auto lens, the movement of the aperture reporting lever as you change
the aperture setting on the lens simply tells the body that the lens is set
to 'n' stops less than full aperture. It doesn't signal a particular
f-stop.
SO the answer to your initial question is a definite "Yes" - they all do!
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Curtis P. Hedman
Sent: 10 January 2005 18:57
To: olympus@xxxxxxxxxx
Subject: [OM] "Stopped Down" Preview Metering?
A question for the experts again....
Do any of the OM series permit or support "stopped down" metering before the
shutter is released? I have been doing some experimentation with a pin-holed
body cap, and the Loreo PC lens in a cap, and finally figured out that the
body cap has no provision for communicating "maximum aperture" to the body,
so the "preview exposure metering" of the "auto" mode is hopelessly
confused. I am assuming that the OTF metering during actual exposure works
just fine (but haven't actually proved this with actual film, yet). I did
note, however, that when I put one of these "caps" on my OM-PC and switch to
"Program" mode, the viewfinder display is happy to estimate a shutter speed
that appears to be about right for the lighting conditions/film speed (this
is with the Loreo PC, which has two aperture settings - f/11 and f/22). In
Auto mode the OM-PC displays the "longer than
1 second" icon with the same setup/conditions....
So I'm coming to the conclusion that I should just forget about using the
finder display to "preview" the exposure with any of these gadgets, and rely
on an external meter, or just fire away and let the OTF metering do its
thing... and it would seem to me that same situation would apply if I use a
microscope or telescope adapter - true?
Any insight will be appreciated!
Curt
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