I actually had forgotten about that. Yes, there seems to be very
slight contact between the baffle inside the rear of the 180/2.8
and the metal ring around the front element of the 1.4X-A. It's
nearly imperceptible and occurs only the last one or two mm of
focus ring rotation before full infinity focus, and it's not glass-
to-glass at all. It's not really a problem, just something I
noticed.
Walt Wayman
---------- Original Message ----------------------------------
From: Roger Wesson <roger@xxxxxxxxxxxxxxxxxxxxxxx>
Reply-To: olympus@xxxxxxxxxxxxxxx
Date: Mon, 18 Mar 2002 17:20:08 +0000
>The serial number thing is mentioned on this page:
>
>http://www.star.ucl.ac.uk/~rwesson/eSIF/om-sif/lensgroup/14xa.htm
>
>Walt Wayman posted a while back that with his examples of 180/2.8
>pre-200,000 and 1.4X, there was some minor mechanical
>interference at infinity focus, although the eSIF mentions
>optical design. Seems there's no glass-on-glass collisions or
>anything like that, though.
>
>Roger
>
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