I've go the same lens and I must say I've not noticed it being
exceptionally noisy, however, to be honest I've never used it in a
very quite place either. I do find it hunts quite a bit at 300 mm if
you are not in a well lit situation (I often end up going to MF) but
I've not noticed it being loud.

I'll test it out again tonight....

Bates.....


The sound I'm hearing is definitely the IS and not the auto focus. If I
turn off IS, I don't hear the sound. It is a constant rapid clicking or
maybe grinding sound. Not sure how to describe it.

Thanks for your help.

BEK