The RMS thread is the British Standard Whitworth full form. The ANSI version
of this thread is based upon the Truncated Whitworth form. /jnm
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx
[mailto:owner-olympus@xxxxxxxxxxxxxxx]On Behalf Of Wayne Harridge
Sent: Sunday, April 28, 2002 9:41 PM
To: olympus @ Zuiko . sls . bc . ca
Subject: Re: Re: [OM] Need Information
> Mark Dapoz <md@xxxxxxxxxxxx> wrote:
>
> 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.
>
Are these sizes converted from metric, seems like the numbers are pretty
weird
for imperial ? Is RMS a metric standard ?
Wayne Harridge
http://members.optusnet.com.au/~w_harridge
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