Description of Computar T0812FICS-3

The size of camera’s imaging device also affects the angle of view, with the smaller devices creating narrower angles of view when used on the same lens. The format of the lens, however is irrelevant to the angle of view, it merely needs to project an image which will cover the device, i.e.; the same format of the camera or larger. This also means that 1/3” cameras can utilize the entire range of lenses from 1/3” to 2/3”, with a 1/3” 8mm lens giving the same angle as a 2/3” 8mm lens. The latter combination also provides increased resolution and picture quality as only the centre of the lens is being utilized, where the optics can be ground more accurately.

The focal length of the lens is measured in mm and directly relates to the angle of view that will be achieved. Short focal length provides wide angle of view and long focal length becomes telephoto, with narrow angle of view. A "normal" angle of view is similar to what we see with our own eye and has a relative focal length equal to the pick up device. The "Computar" range calculator is simple device to use for estimating focal length, object dimension and angle of view, alternatively the VM300 view finder gives an optical way of finding focal length.