Sorry, Moose. 0.19mm (46.08-45.89) difference seems a lot! I remember Canyon
New F1 claimed they controlled the tolerance to 0.02mm. I just made some
measurements on an OM1n and OM2n, the four corners of the guide rails are no
more than 0.035mm difference, this already included the errors from my not
so flat table (but I did measured more than two times at different locations
of my table).
http://www.accura.com.hk/temp/TOL.jpg
Another interesting figure, for the OM 50/1.4, focus from 10 meter to 5
meter the lens extended around 0.25mm (this measurement may not be very
accurate but should be within 0.03mm)
C.H.Ling
----- Original Message -----
From: "Moose"
>
> So for fun, I grabbed an OM-1 and a digital micrometer. The distance
> from the front of the mount to the inner film rail varied slightly from
> point to point, with a maximum of 46.08 mm and minimum of 45.89 mm. To
> further emphasize the fact that such numbers aren't exact, The
> micrometer spec is resolution and repeatability of .01 mm, but absolute
> accuracy of .02 mm. The micrometer is quite new, so should be in spec.
>
> Adjusting the measurements for that, the range of register distances on
> this one OM-1 may be as wide as 45.86 to 46.11 mm.
>
> My suggestion? Just use the nominal spec. of 46 mm and don't worry about
> it.
>
> Moose
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