Thanks to all who replied about my tight manual focus ring. Firstly, I
would
not have been surprised if there were any banging or abuse of the lens. It
has lived a very gentle life - never shipped, dropped, exposed to water,
burned, run over, trampled by horses. I did talk to Horizen Electronics
(about my A2's, figuring it was time to consider replacing the control
knob, since a cleaning and calibration would hardly cost more). I mentioned
the
problem and they said that they had seen a couple of them with screws which
hold the internal helical tube back out just enough to cause binding. The
assembly is made mostly of plastics and vibration results in loosening.
The lens hasn't really even been subjected to much bouncing, but the
explaination sounded plausable. They don't treat IS lenses under warranty
and recommended that I send it to Canon.
Mike Breen
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