23 February 2011
12-1
The focal length of the lens is the distance, expressed in millimeters, from the front element of the lens to the focal point. The focal point is the point at which the light rays intersect on their way to the focal plane, where the chip is positioned.
12-2
Professional videographers group focal length of lenses into normal, wide-angle, and telephoto.
Normal - focal lenth lenses produce images that closely resemble human vision.
Wide-Angle - focal lengths include a wider field of view than normal lenses.
Telephoto - focal lengths show a narrower, more restricted field of view.
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