Wayne, I'm by no means an expert on OM gear, but I know of no accessories
that screw into the ends of the focusing rail. Their only purpose to my
knowledge is, as you said, to prevent the standards from falling off the
ends.
If in fact the threads are an american standard thread, which I highly doubt
since they were made in Japan, and are not 1/4-20, the finer 1/4 inch thread
is 1/4-28. My guess, just from glancing at them, is that they're either 5mm
or 6mm. Unless someone else happens to know off-hand, I work at a machine
shop and can take mine to work this evening and check to find out for sure.
As to mating two rails together, physically it could be done with a simple
stud of the proper size. However, unless I misunderstand your question, this
wouldn't be very practical since the rack gears don't extend fully to the
ends of the rail. Therefore you'd end up with about a 1" gap between gears,
resulting in the standards sliding freely along the rail.
Hope that helps,
Darin
Wayne Harridge wrote:
>
> At each end of the rail of the OM bellows there is thumb screw which stops
> the bellows standards falling off the end of the rail.
>
> Were there any accessories that also screwed into these holes in the end
> of
> the rail ?
>
> The threaded holes appear to be about 1/4" diameter but finer than 20tpi
> so
> a standard tripod screw cannot be screwed in. What is the thread size for
> these holes ?
>
> Is it possible to join 2 sets of bellows together for extra extension ?
>
> ...Wayne
>
>
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