>Personally, I think it is because IS can screw up your composition.
>Have you ever noticed that sometimes, even handheld, the IS system will
>cause the image to "migrate" around the viewfinder, that is, to move to
>the left or right or somewhere, and then it sort of stays there.
This is exactly what happens if I use my EF300L f/4 IS on a tripod. When I lease IS on
the picture sort of 'moves' from left to right on the viewfinder. I've heard that this
'bug' has been solved in the second generation IS lenses. Also in the manual it is
clearly stated that when this particular lens is used on a tripod that the IS function
should be disabled.
Arnoud
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