Bij de Canon 100-400mm staat het volgende over de IS:
Image Stabilizer
The Image Stabilizer (IS) reduces blurring due to camera shake when shooting without a tripod. With IS activated, blurring due to camera shake is reduced to what would be expected had the photograph been shot at a quarter of the shutter speed (i.e. 2 stops).
To enable the Image Stabilizer, set the Stabilizer switch to "1". If you intend to shoot with the lens kept stationary, select "Stabilizer Mode 1". If, instead, you intend to pan the lens to follow a subject moving horizontally or vertically, select "Stabilizer Mode 2".
Activate metering and/or autofocus, and the Image Stabilizer will automatically engage. Pause for about one second to allow the lens to settle, then shoot your photograph.
Note: When the lens is mounted on a tripod, set the Stabilizer switch to "0". Otherwise, the Image Stabilizer might attempt to compensate inappropriately for the tiny movements, possibly producing blur.
jul: Mode 2 does not seem to help when panning in a diagonal direction.
jul: IS counteracts SMALL pitching and yawing movements. It cannot overcome HUGE movements, such as encountered in a car travelling along a bumpy road. There is NO effect on ROTATION movements, that might occur if the shutter release button is jabbed, rather than squeezed gently.
Dit geldt ook voor de 70-300mm.
Groet,
Ruud
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Canon body`s en Canon L glaswerk. Feisol 3371 statief + Jobu BWG-HD schommelkop.