Do you have a link to prove your statement?
[{POST_SNAPBACK}][/a]
Jonathan is correct.
I know that somewhere there is official documention from Canon which details the capabilities of the different generations of IS. I can't put my hands on it at the moment, but here is an excerpt from Michael's review of the 70-200 f/2.8 L IS:
"As with their other recent high-end IS lenses, the IS does not need to be disabled when the lens is tripod mounted."
[a href=\"http://www.luminous-landscape.com/reviews/lenses/70-200is.shtml]http://www.luminous-landscape.com/reviews/.../70-200is.shtml[/url]
Update: here's a list (somewhat out of date) from Canon's Chuck Westfall with those IS lenses which do and do not support "tripod IS:"
The EF Image Stabilizer lenses listed below support "tripod IS." The IS switch may be left in the on position when using these lenses on tripod.
EF28-300mm f/3.5-5.6L IS USM
EF70-200mm f/2.8L IS USM
EF70-300mm f/4.5-5.6 DO IS USM
EF300mm f/2.8L IS USM
EF400mm f/2.8L IS USM
EF400mm f/4 DO IS USM
EF500mm f/4L IS USM
EF600mm f/4L IS USM
The EF Image Stabilizer lenses listed below do not support "tripod IS." The IS switch should be in the off position when using these lenses on a tripod.
EF28-135mm f/3.5-5.6 IS USM
EF75-300mm f/4-5.6 IS USM
EF100-400mm f/4.5-5.6L IS USM
EF300mm f/4L IS USM
Paul