On Sun, 28 Apr 2002, James N. McBride wrote:
> I need to know the specification for the mounting thread on a Zuiko f-3.5
> 20mm macro lens. I've heard it referred to as the Royal Microscope Thread
> which I can't confirm. The RMS thread is the same as the ANSI Microscope
> Objective Thread at a max dia. of .7941 inches and thread pitch of 0.027778
> inches. The threads on the lens look very close to that but I don't have a
> good way to check for sure. Can anybody tell me if that is the thread size.
Yes, the lenses should have the Royal Microscope Thread (aka, the Royal Screw)
threading. I just checked one of mine and it has an outer diameter of .794"
and the thread pitch is 36NF (national fine). That works out to 1/36" for
the pitch, which would be 0.027778.
-mark
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|