Sorry dje, it's not as simple as that! 5x or 10x tells you the difference between the angle at maximum and minimum zoom, but the manufacturer can choose what either extreme is. The standard 35mm camera has a lens with 50mm focal length, and this will give an angle of view about 40deg across the 36mm picture width, which roughly equates to the human eye, and so results in a natural looking picture. Zoom lenses for digital cameras will often be quoted according to this 35mm equivalent. My Sony DSC-P71 has a 3x optical zoom, with a 35mm equivalent narrow angle of 117mm, which is slightly tighter than half the 35mm standard (117/50 = 2.3). If you can tell me what scene width you want to cover at what distance, I'll tell you roughly what 35mm equivalent you need, but it's always a good idea not to zoom too tightly then you can do the final trimming on your computer.