Google is your friend, Stefan! 

>From Peter K Burian's article in Shutterbug oin 2000
(http://shutterbug.com/equipmentreviews/lenses/0800sb_canon/)

With previous IS lenses, Canon warned that the stabilizer would act
erratically when using a tripod. With the latest series of IS telephotos
however, the system has a special new mode. It corrects for camera
vibration--even minimal vibration caused by shutter movement or reflex
mirror slap--when the lens is mounted on a tripod. This Image Stabilizer
"tripod mode" is activated after about a second of gentle pressure on the
camera's shutter release button and is a significant advantage with long
focal lengths, increasing the odds of razor sharp images. 


>From Canon (USA)
(http://www.usa.canon.com/consumer/controller?act=CanonAdvantageTopicDtlAct&;
fcategoryid=149&id=2646)

With a monopod, the Image Stabilizer on all IS lenses operates normally as
during hand-held shooting. Also, the EF 300mm f/2.8L IS USM, EF 400mm f/2.8L
IS USM, EF 500mm f/4L IS USM, and EF 600mm f/4L IS USM lenses have a
mechanism that allows the Image Stabilizer to function properly while the
lens is mounted on a tripod.

And a specific article about IS and tripods:
(http://www.dlcphotography.net/TripodAndIS.htm)



> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of 
> Stefan Gerris
> Sent: Wednesday, September 06, 2006 9:17 AM
> To: [email protected]
> Subject: Re: EOS Stabilizer or not
> 
> 
> You are right, I mixed the 2 up (I hardly ever use the 
> switch). But how about the tripod mode? Can anyone confirm 
> that the lens actually switches off the IS system when it 
> detects it is on a tripod?
> 
> Cheers, Stefan
> 

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