Archived posting to the Leica Users Group, 1996/11/24

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Subject: It really IS 26tpi!
From: Marc James Small <msmall@roanoke.infi.net>
Date: Sun, 24 Nov 1996 16:11:44 -0500

At 09:22 PM 11/24/96 +0000, you wrote:

>Shoot. 39mm by 26 tpi is as much a collision of imperial/metric 
>worlds as using 255/75R16 for tire size.
>It hurts my eyes. Awful!....:-))


But that is EXACTLY the point.  It is NOT 39x1mm, it is 39mm by 26tpi.
Canon made this mistake, too, and that's why they never quite got it right.
See Dechert's CANON RF CAMERAS for a discussion.  Some of the early FED
cameras show the same mistake.  

There was a US ad campaign back in the '60's about a 'silly millimeter' but
that's really the case here.

It IS 39mm wide by 26 turns per inch.  Why Barnack mixed Imperial and
metric, ich weisse ist nicht.  But he did.

Marc


msmall@roanoke.infi.net  FAX:  +540/343-7315
Cha robh bas fir gun ghras fir!