Before the site downtime, I'd set a weekly quiz question about Image Stabiliser modes. The question was: "Which IS mode would you use when panning with a moving subject?"

The Options were Off, Mode 1 or Mode 2. 

The answer is Mode 2 and 65% of you got it right. 

Now, not all IS lenses have the two modes, but for those that do, this is how they work:

Mode 1 - the lens will stabilise camera shake in both an up and down and side to side orientation. So any camera shake will be corrected for. 

Mode 2 - the lens detects the direction of panning and then instead of trying to compensate for that horizontal motion, it ignores it and concentrates on the motion at 90degrees to it. This way you can get smooth pans without fighting the IS mechanism. 

Clearly if you don't have a Mode 2 on your lens, you're left with Off and On. Our recommendation is to turn it off. You'll need to be smoother with your panning and having a tripod or gimbal style head will help, but as long as you move through a nice smooth arc, you can still get good results. 

Well done to those that got it right. This week's weekly quiz question is along the IS lines as well. Go give it a go. And if you don't know, guess! Your entry is anonymous so there's nothing to be worried about if you get it wrong!