One pin moves the coupling ring inside the body up and down as you turn the
diaphragm ring on the lens, this makes shutter speed change in the
viewfinder, etc. It has no affect on auto exposure, which is read off the
film.
The other pin or lever stops the lens down to shooting aperture as the
mirror goes up. That one is important. Though, in auto OTF, you get the
shutter speed based on how much light comes through the lens, not what click
stop the lens is set to.
----------------------------------------------------
John Hermanson www.zuiko.com
mail: omtech@xxxxxxxxx
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 Turnaround 4-5 weeks
----------------------------------------------------
----- Original Message -----
From: "Piers Hemy" <piers@xxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, December 05, 2003 4:59 PM
Subject: Re: [OM] OM Pin-hole photography problem - help!
> OK, that's clear ... so what does the aperture reporting pin do John?
>
> And how does it (what it does) differ between auto and manual lenses?
>
> Stinkin' inquiring minds, you know the score!
>
> Piers
>
>
> -----Original Message-----
> From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
> On Behalf Of John Hermanson
> Sent: 05 December 2003 21:39
> To: olympus@xxxxxxxxxxxxxxx
> Subject: Re: [OM] OM Pin-hole photography problem - help!
>
> Coupling pin will only affect manual metering. OTF auto don't need no
> stinkin' pins.
> ----------------------------------------------------
> John Hermanson www.zuiko.com
> mail: omtech@xxxxxxxxx
> Camtech, Olympus Sales & Service since 1977
> 21 South Lane, Huntington NY 11743-4714
> 631-424-2121 Turnaround 4-5 weeks
> ----------------------------------------------------
> ----- Original Message -----
> From: <john@xxxxxxxxxxxxxxxx>
> To: <olympus@xxxxxxxxxxxxxxx>
> Sent: Friday, December 05, 2003 1:42 PM
> 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.
> >
>
>
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