I recently purchased a Canon EF 70-200mm F/4.0 IS Lens for my new Canon T1i (both from Best Buy), I am very happy aboutthe new lenses Imagequality but however I am little worried about the faint "whirring" noisewhen the Image Stabilizer is engaged.


I am not worried about the the "clunk" that it makes during autofocus, but the "whirring" is more prominent with IS On and wades off after a second from the picture has been taken. And the noise stays on when Live Mode is On - apparently while captuing HD video this noise is also captured


Is this a know issue with this lens or is this happening only to me?



> engaged when the shutter button is pressed, it will make a "clunk"
> noise.