04841322 is referenced by 42 patents and cites 6 patents.

A camera and interchangeable lenses for such camera in which it is automatically detected whether or not the lens mounted on the camera has an automatic focusing capability. If it does, respective sets of electrical contacts provided on the lens and camera body are employed to transmit and receive a series of different data between the camera body and the lens. If it does not, the only a single datum is transmitted, for example, an open lens-stop value of the lens, is transmitted over the two sets of contacts. An automatic focusing actuation voltage applied from the camera body can be sensed to determine whether or not the lens has the automatic focusing capability.

Title
Camera having interchangeable lenses
Application Number
103311
Publication Number
4841322
Application Date
November 1, 1988
Publication Date
June 20, 1989
Inventor
Osamu Sato
Tokyo
JP
Masahiro Kawasaki
Tokyo
JP
Agent
Sughrue Mion Zinn Macpeak & Seas
Assignee
Asahi Kogaku Kogyo Kabushiki Kaisha
JP
IPC
G03B 7/20
G03B 3/10
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