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[OM] How does metering work in reverse (was 1:1 with 50mm)

Subject: [OM] How does metering work in reverse (was 1:1 with 50mm)
From: Dan Lau <dlau@xxxxxxxxxxxxxxxx>
Date: Fri, 18 Sep 1998 10:39:41 -0700
On Fri, 18 Sep 1998 12:42, Pauls0627@xxxxxxx wrote:
> A reversing ring lets you put the lens on "backwards". It has a filter thread
>on one side, and a lens mount on the other that mounts onto the camera.
>
>Paul Schings
>Coventry, RI

I've never tried reversing the lens, but since this topic was brought up,
I'd like to know how metering works when the lens is reversed.  Also,
how does the aperture get closed down when you take the picture, as the
linkage is now at the other end of the lens, away from the camera.  My
naive thinking is that the aperture information is not passed from the
lens to the camera, so no matter what you set the aperture on the lens,
the camera will always think it is wide-open.  So can I still use the
meter of an OM-1, for example, with a reversed lens?

I can understand how a camera that does OTF metering can work, but then
how do you close down the aperture to take the picture?  I don't remember
any switch on a 50/1.8 lens other than the DOF button.  Can someone help
to "initiate" us into this wonderful world of reverse lens photography?
Thanks.
        -Dan

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