Ever since I first tried my Z1 I have seen thing vertical lines on the screen. I initially thought that this was the screen, but it can't be as the lines stay in position as i move the screen and don't move with it. The lens appears to have an area on it where it looks slightly roughed up. This was on it when i bought it new and is slightly square in shape. I assumed that this had no detremental effect on the picure as I could so no obvious signs of a problem, but could this roughed up patch be causing these lines? Could any Z1 owners check their lens' to see if they too have this patch? Thanks.