On 30 Nov 98, at 13:15, Christopher Biggs wrote:
> > >
> > I assume M42 and T mount are not the same?
>
> Alas, no. (Actually, I thought so too at the time I bought the lens).
>
> >
> > How much different is the M42 mount?
>
> Just enough to be pointlessly aggravating.
>
> M42 (aka Pentax Screw-Mount) is 42mm x 1mm.
>
> T mount is 42mm x 0.75mm.
>
> Tamron introduced the 42mm T mount in competition with the existing
> 42mm Pentax mount and 39mm Leica mount. Tamron also used a different
> mount-to-film distance (for a good reason). As far as I can tell, they
> changed the thread-pitch for no good reason (perhaps to allow a
> lower-profile mount?)
>
> I know my local store will order me an adapter for either of the above
> (probably taking forever)---and I plan to phone around trying to find
> somebody with one in stock. I was wondering if anyone knew a
> mailorder place (or any other source) that has adaptors.
>
> B+H and Freestyle's catalogs both make no mention. I hear Cambridge
> have them, but I also hear---other things---about that establishment.
>
> BTW, source of much of the above info:
>
> http://www.smu.edu/~rmonagha/bronmounts.html
>
Chris,
Thanks for the info and interesting link. Next time I see either of these
mounts I will grab them!
Shawn & Janis Wright
swright@xxxxxxxxx
http://Zuiko.sls.bc.ca/~swright
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