[adr1an]

I've heard a lotta reports of people getting motion sickness with lens IS..

I suffer some sort of "sickness" when I stare for a long time through the VF with OS enabled (like when Manual Focusing in Low Light or for the heck of it) on close focused objects (say a Coffee cup on a table edge with the rest of the table fanning out in view to the distant wall) .... But 'normal' use is fine.

I also put sickness in quotes - because I don't suffer anything anywhere else that I can compare it to - but I'm lead to believe its most likely the equivalence of motion sickness....

Anyway - ok in short doses - does start making you feel giddy after prolonged staring at *close* objects depending on field of view.... (doesn't seem to happen when viewing distant ones - or if looking straight down on an object with a background that fills the VF)

[interested_observer]

The reason why you are unable to use both Lens based stabilization and body based stabilization together at the same time is because they work in series, and do not cooperate.

• Essentially, the light enters the lens and the lens has a set of motion sensors that detect the motion and its direction. This is then applied to a lens element so as to reduce/eliminate the motion and stabilize the light on to the sensor (i.e., its corrected or stabilized light).
  
• The camera body has a similar set of motion detectors that determining the amount and direction the forces. They in turn adjust a series of magnets that hold the sensor floating within a defined space. The magnetic move the sensor in such a way as to negate the sense movements.

The problem is that if the light is corrected by the lens, then the camera body attempts to correct the movement also, the movement is essentially put back in and the image appears blurry. Therefore you can only have one stabilization active at any one time. You the photographer need to select which one to use and turn the other one off.