Equivalent Focal Length: Distance in a lens between the front nodal point and the focal plane when the lens is set to focus a subject at infinity. In a telephoto lens the equivalent focal length is shorter than the back focus. The reverse is true in a wide angle lens.

 

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Equivalent Focal Length: Distance in a lens between the front nodal point and the focal plane when the lens is set to focus a subject at infinity. In a telephoto lens the equivalent focal length is shorter than the . . . View Full Definition

Focal Length: The distance from the lens' optical center to its focal point, usually measured in millimeters. There are three conventional types of focal length: wide angle, normal, and telephoto.

35mm Equivalent: Focal length is a measure of the distance (in millimeters) from the optical center of a camera's lens to its focal point, which is located on the image sensor. Because digital cameras' focal . . . View Full Definition

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Hyperfocal Distance: Distance between the camera and the hyperfocal point.

Hyperfocal Point: Nearest point to the camera which is considered acceptably sharp when the lens is focused on infinity. When a lens is focused on the hyperfocal point, depth of field extends from a distance . . . View Full Definition

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Focal Plane: The plane within a film camera where the light strikes the film.

Fixed Focal Length: Camera system whose lens cannot be interchanged for a lens of different focal length.