Thanks for that Kimbo.I don't believe now that I have a problem,it's just that I wasn't expecting any play at all.

Having recently purchased an *istDS with this lens I was suprised to find that the front section of the lens has slight radial movement when fully extended ie when set to 18 or 55.It doesn't appear to cause a problem but all my M series lenses have no movement at all.The question I'm asking is,is this normal or is the lens faulty?
Any comments/observations would be welcome.

John