Focal+Length+4


 * Focal Length**

Camera lenses are organized into three seperate groups according to film size and focal length; normal, telephoto, and wide angle. A normal lense is similiar to that of normal vision. A normal lense for 35 mm film has a focal length of about 50mm. A telephoto lense acts like a telescope to maginify an image. This means if you were to use a 200 mm telephoto lens with a 35 mm camera the image would be maginifed 4 x. The field of view is determined by the angle of view from the lens out to the scene and can be measured horizontally or vertically. Larger sensors or films have wider FOVs and can capture more of the scene. The FOV associated with a focal length is usually based on the 35mm film photography, given the popularity of this format over other formats.


 * Typical focal lengths and their 35mm format designations ||
 * < 20mm || Super Wide Angle ||
 * 24mm - 35mm || Wide Angle ||
 * 50mm || Normal Lens ||
 * 80mm - 300mm || Tele ||
 * > 300mm || Super Tele ||