sigma 120-400mm lens

i need help with the info from sigma it tells me not to use optical stabilizer when the lens is mounted on a tripod My question is do i need to keep the optical stabilizer in the off position when i have it on a monopod or set the stabilizer switch to position 2 any coments would be welcomed as this is a new lens

Maybe because it wastes power and more importantly it actully causes shaky images when on a tripod.

correct me if im wrong...

Image stabiling systems use sensors to detect movement and then they compensate for that movement by adjusting the position of optical elements in the lens. When you're using a tripod and the image stabilization is turned on, the sensors can get confused because there isn't any movement. Then - in theory anyway - they may actually try to compensate anyway, causing motion blur. With a monopod I think you've got a little movement, so it should be fine. It's really only if you have none that it's something to worry about.

Like John said, it should be fine on a monopod, because there likely will be some camera movement. Keep the image stabilizer switch in position 1 though. Position 2 is used for panning because it compensates for up and down movement, but not side-to-side movement.