Situations where the Image Stabilizer is not effective
EF100-400mm F4.5-5.6L IS USM

The image stabilizer should be  0 (OFF) in the following situations. If  the switch is 1 (ON), the image  stabilizer may not operate correctly.

• Shots using a tripod
• Bulb (time exposure) shots
• In MODE 1: panning shots where  there is considerable camera movement.
• In MODE 1: shots from vehicles,  where there is considerable motion.
• In MODE 2: shots other than  panning shots.

The image stabilizer does not  operate for self-timer shots using the  EOS 50/50E/ELAN Il/ELAN IIE, EOS IX and  IX Lite/IX 7.

All the power for the lens is  provided by your EOS camera. If the  image stabilizer function is applied  for about 10 seconds in each frame, the  normal shooting capacity of the camera  will be reduced by approximately 30%.

The image stabilizer does not  operate with the manual-focus EF-M  camera.