Definitions for "Normal Lens"
A lens where the focal length is approximately equal to the diagonal of the film size it's being used for. This is also representative of the field of view of human sight. In 35mm format it is approximately 50mm, in medium format approximately 90mm, in 4x5 approximately 250mm.
A lens that shows objects without severely exagger- ating or reducing the depth of the scene's planes. In 35mm filming, a normal lens is 35 to 50mm. See also telephoto lens, wide-angle lens.
A lens that shows objects without severely exaggerating or reducing the depth of the scene's planes. In theatrical filmmaking, a normal lens is 35mm to 50mm. See also telephoto lens, wide-angle lens.