A good point there John-bach.
You will surely get an incorrect viewfinder reading, but it may well be that
the OTF exposure will be OK. Assuming that the pinhole does cover the 24x36
frame evenly. Otherwise there may be a similar effect to that which
prevents use of OM-1 metering with a fisheye.
However, I think we are agreed that if you are integrating spot-readings,
the meter has to 'know' what aperture is set on the lens, because it doesn't
actually 'see' the effect of the aperture until exposure.
Piers
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of john@xxxxxxxxxxxxxxxx
Sent: 05 December 2003 18:43
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] OM Pin-hole photography problem - help!
On Fri, 5 Dec 2003 08:56:55 -0000, "Piers Hemy" <piers@xxxxxxxx>
wrote:
>There is a tab on any OM mount lens which reports the aperture set on
>the lens. If you don't have a pin engaged with the aperture reporting
>cam on the body, you will get up to 6/7 stops overexposure. Try a 7mm
>manual extension tube, which has the fixed pin to do the necessary.
>
Is this really so? I thought the great beauty of real-time OTF metering was
that it simply integrates the light received by the film, and closes the
shutter when it's done (or quenches the flash if one is attached). It
shouldn't matter about coupling pins or anything else in auto mode. Manual
metering - that's another story!
Am I right? Perhaps John H could chip in with his wisdom!
Regards
John Gruffydd (Mold, Wales, UK)
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