Johns probably right, it's bound to be a single lens but a lens group being moved vs the sensor. "Probably" a considerably larger mass in the lens elements.

William Robb wrote:


----- Original Message ----- From: "J. C. O'Connell" Subject: RE: Minolta Maxxum wth BODY IS



I do not think that IS in a lens involves simply rotating
a lens , it involves moving a lens (mass) laterally.


And in body IS is not moving anything?

William Robb




--
I can understand why mankind hasn't given up war. During a war you get to drive tanks through the sides of buildings and shoot foreigners - two things that are usually frowned on during peacetime.
--P.J. O'Rourke





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