Angenieux retrofocus
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The Retrofocus photographic lens was invented in France in 1950 by Angenieux, and is characterized by a large negative meniscus lens element up front followed by four or five small elements in the rear.
The retrofocus lens has its focal point significantly further from the surface of the rearmost lens than would be the case in a lens of conventional construction. Users of 35mm Single-lens reflex (SLR) cameras appreciate the retrofocus construction, otherwise very short focus lenses would interfere with the operation of the mirror.