Lens attachment for a photographic camera has orientation markings and optical identification coding marks

摘要

A lens attachment [1] for use on a photographic camera has a locking feature [2] on one end for location onto the camera body. This has markings [4] to indicate the orientation relative to the locating surface [6]. Latching elements [8] are organised in sectors. An identification coding is provided by a series of light absorbing [11] and light reflecting [12] elements.