optical zoom
Definition:
Optical zoom refers to using your digital camera to zoom in on, or magnify, your subject. The amount you are allowed to zoom is usually indicated by a number followed by an x such as "3x optical zoom" which in this case means the ratio of the longest to shortest focal length on the digital camera lens is 3:1. Optical zooming uses the digital camera's lens to perform the zoom which produces a far superior picture than optical zoom's counterpart, digital zoom.
Here's a word you may not know...
high definition television
High definition television (HDTV) provides a much higher-quality television picture and audio than a standard television. High definition programming also differs from standard television programming in that it is delivered using a digital signal as opposed to an analog signal and has an aspect ratio of 16:9 vs. 4:3 for standard television. The wider aspect ratio is what gives high definition television its widescreen look and feel.
