Originally posted by LesDMess Of course Olympus lenses I have seem to have their aperture rings on the end of the lenses too. Although I have a third party lens with the ring at the base because the same lens is available for other brand bodies. The only other camera I have with the shutter speed on the lens mount is the Nikkormat FT3 and it also doesn't have an aperture window. I wonder if this design precludes that?
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There are two design choices that preclude an aperture display in the VF. Firstly, placing the aperture scale at the front of the lens precludes the use of an optical ‘Judas window’. Secondly the mechanical couplings of the OM mount only tells the camera how many stops the lens aperture is stopped down, it doesn’t tell the camera the lens maximum aperture which is needed to calculate the actual aperture value. A separate coupling would be required for this, which could then be used to display the selected aperture in the VF, by rotating a mechanical disc or electronic display.
I suppose the design of the OM1 with the top cover prism housing closely sculpted to the shape of the glass prism ruled out the inclusion of a mechanical aperture indicator. Electronic displays were still some time off in 1972 so the designers didn’t have the foresight to include the required lens coupling so the aperture could be displayed in future cameras.
The Contax 139 is a great example of a compact SLR which is the same size and weight as an OM camera but with a mechanical aperture indicator in the VF. The aperture display is actually much easier to read than the Judas window design.
---------- Post added 07-13-21 at 02:05 AM ----------
Originally posted by Jonathan Mac It's not that the Oly cameras aren't that common, just that there aren't any bargains to be found on them.[COLOR="Silver"
It depends what your threshold for a bargain is. If it is <€£$50 then I agree, you can’t get an interesting Olympus for that.
However if your threshold is a bit higher I think the OM2N is an incredibly good buy now. I was lucky enough to find one from a UK dealer at £90 in mint condition with new seals. These are beautifully made cameras designed for professional use.
OM1s are generally not cheap now and have the annoying problem of needing a mercury battery adapter.