Could it be the lens? Sigma lenses have known to have some self-destructive 
devices built-in.

regards,
Alan Chan

>I've noticed that the autofocus on my MZ5 seems less accurate now than when
>I first got it.  Has anyone else had problems with this?  The AF seems to
>often settle on a focus that I can easily see is wrong in the viewfinder.
>  But when I first bought the camera, this didn't happen.  The lens is a
>Sigma 28-80 f3.5-5.6.  I suspect the contacts between the lens and camera
>may need cleaning, but I'm not sure how to do that.  I also have to check
>whether it is certain filters making the problem worse.  Circular 
>polarisers
>don't seem to help.
>
>It makes AF a bit pointless because I end up manually focussing.
>
>Rob


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