Question about the IS on 28-135mm IS

I was at the local camera shop yesterday and attatched a canon 28-135mm IS to my camera. I turned IS on and played around.

I thought I remember reading in another thread that you can either See or hear the IS working. Is this correct, because i noticed neither?

thanks
PJ

Yes, you can hear a faint buzz as soon as you press the shutter half way down: the gyros starting spinning. They will stop if you don't shoot within a couple of seconds.

Yes, it is a faint sound. To me, it is a little more like a humming sound, but very quiet.

Also, if you half-press the shutter button, you may see the stabilized lens effect snapping the viewfinder image a little back and forth as you swing the camera around.

---Bob Gross---

To hear the gyrating motors put the camera and lens up to your ear. Press and hold shutter release half way (to achieve focus). You will hear the faint sound of a motor running in the lense. The IS is compensating for your movement.

Once again, I appreciate the info you all have provided me with.

Now I have to make the decision between this and the tamaron 28-75mm!

thanks
PJ