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Meaning of retrofocus lens

ret'ro•fo•cus lens'

Pronunciation: (re'tru-fō"kus), [key]
  1. a wide-angle lens, for use on single-lens reflex cameras, of inverted telephoto design, with a back focus greater than the focal length.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.