4/3 Chip
From The Glossary of Digital Photography
A chip is the image sensor in a digital still or video camera. A 4/3 chip is a chip with an aspect ratio of 4 to 3, which means 4 units wide by 3 units high. Some of the earliest digital cameras available to the public were 640 pixels by 480 pixels, and were called simply 640 x 480. This figure is equivalent to a 4 to 3 ratio, written 4:3, hence a 4/3 chip. The same 4:3 ratio is used in NTSC American television, and is therefore used in many consumer digital video cameras. The 4/3 chip is used in many consumer, or compact, digital still cameras as well. Digital SLRs tend to use a 3:2 ratio chip to fit better in the common ratio of 35mm film. Other common sizes of chips include 16:9 and 3:2. See also: chip; NTSC; 16:9 chip
