IS question

Should the IS effect be visible in the viewfinder/live view? I have noticed the composition/frame moving slightly several times, most recently on the tripod. It doesn't seem it would be visible when camera is on tripod since there shouldn't be any camera movement to correct.

Mark

Some IS lenses tend to hunt while on a tripod. Newer lenses like the 70-200 2.8 II doesn't.

yes

IS effect is visible through the viewfinder in camera systems where the IS is in the lens (i.e Canon/Nikon). If you're holding it and engage the IS while looking through the viewfinder, you'll see it as the image becomes more stable (as the name implies). However, if you engage it while on a tripod, you may see the image "jump" a bit as the system attempts to compensate for movement that isn't there. This is why it's frequently recommended to turn off IS when shooting from a tripod; IMO, regardless of whether the lens is supposed to be "tripod sensing" or not.