Term - Retrofocus

Retrofocus

A type of lens design with a negative lens element positioned in front of the diaphragm and a positive lens element positioned at the rear of the diaphragm. This makes the distance from the rear of the lens to the focal plane longer than the lens focal length. Retrofocus design has been adopted in wide angle lenses so the rear of the lens does not impede the movement of an SLR camera's reflex mirror.

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