With an optical zoom of 21 times zoom factor, the SP-620UZ has a fairly big optical zoom compared to most of the other medium megapixel cameras that were released more than two years ago. The smallest optical zoom of medium megapixel cameras that have been available for around the same time as this camera is 0.34x, the biggest is 65x, and the average optical zoom is 14x.
It may also be worth also looking at one of the alternative 21x optical zoom digital cameras currently available including the Nikon L120 which has better reviews.
Cameras with a bigger optical zoom that might be worth looking at include the Stylus SH-60 (24x and higher rated), or the Stylus SH-2 (£273.09) (24x and higher rated) both from Olympus.
What does "optical zoom" mean?