Dimage Z3 blurred zoom images
I don't think there's any problem. Simply, a longer zoom means that - without a faster shutter speed - there is an increased probability for camera shake. Additionally, cameras usually struggle with focus in longer zoom. To be sure that there isn't a fault, do this:
1) Place the camera on a tripod or other sturdy surface
2) For additional stability (and to avoid camera shake due to shutter button movement), select the self-timer
3) Focus and take the shot.
If it's still blurry, then yeah, there's a problem