I've never heard this recommended before either on the list or otherwise,
but I have the 7mm manual tube, and have used it mostly to help myself
understand stop-down metering. Being rather thick-headed, I found it the
easiest way, as I can actually see how it works.
Wayne (who doesn't own a pinhole cap though)
>
> 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).
> Piers
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