Having already owned a range of Casio cameras that give a real quality build and practical usability i now wanted to upgrade to the middle generation Casio extra slim cameras and advance to optical zoom and a larger viewing screen. All this came in the Ex-Z850. The very large screen fills the back of the camera giving plenty of space in the new super bright lcd, screen to frame your picture and have a good preview of how it will turn out. The simple controls fall easy to hand, the 3x optical zoom keeps picture quality good when taking telephoto pictures and the new generation larger capacity battery does a fair job of holding its charge. The video recording includes sound and is only limited by your memory card size. The best feature of the EX-Z850 for me is the way Casio have produced a really small pocket sized camera but still managed to retain the large veiwing screen and true optical zoom lense all in a credit card sized really light pocket camera.