effect on the sharpness of the image once they exceed 340,000. Of course, video could never be that simple, and you will typically see sharper images even between 1 Megapixel and 2 Megapixel CCDs. However, this effect is subject to diminishing returns. It should also be noted that there are two measurements for CCD pixels: gross, which is the total number of pixels on the CCD, and effective, which is the number actually used on the CCD. The effective pixel count is what matters.
Zoom can be classified as either optical or digital, and almost all camcorders have both. Normal optical zooms range from 2x to 20x magnification, while digital zooms range from 20x to 800x. While optical zooms use physical movement of the lens mechanism, digital “zoom” is simply digital enlargement of the pixels. Digital zooms result in a blurring of your picture called pixellation.