I am looking at buying the Fuji but I've heard of two potential problems and wondered if anyone out there had heard the same or had any views. The first is that the zoom lens causes vignetting at the wide end of the range. The second is that the autofocus system is confused if you fit a filter, for example an 81c. If the zoom does suffer from vignetting, this would be even worse with a filter fitted. Has anyone any info on these potential problems? Fuji make good gear and I would be suprised if these problems exist but I do not want to make an expensive mistake. Any views/information would be welcome.