Different video formats display using differently-shaped pixels (square or rectangular). This is one of the reasons why an image sensor at 1440×1080 pixels can display video at a 1920×1080 pixel resolution, professional hdv.
The lens plays an important part in how the sensor will work; specific size and resolution of the lens will help the sensor keep its image intact. The resolution of a lens refers to the quality of the lens and the ease and clarity with which light passes through it. Smaller-sized image sensors need a high resolution lens with a wider field of view to squeeze the image onto a smaller area (the image sensor). Smaller chips also allow for smaller lenses, which are more affordable and will keep the costs of the camcorder down.
