Title:
INTERCHANGEABLE LENS SYSTEM
Document Type and Number:
Japanese Patent JPH04280211
Kind Code:
A
Abstract:
PURPOSE:To eliminate the dispersion in performance of AF control to various interchangeable lenses in the AF control of a conversion adaptor for interchangeable lens system and perform a satisfactory AF control. CONSTITUTION:A signal converting means for converting an AF control signal transmitted from a video camera to a conversion adaptor to an AF control signal controllable (drivable) by a still camera interchangeable lens group is provided with a correcting means 29 for giving a correction according to the maximum defocus amount per pitch of a lens 1. Thus, by the function of the correcting means 29, the control speed to the lens 1 in which the optical characteristic is similar thereto and the correcting amount shows the same tendency can be efficiently regulated to realize an intended control speed, whereby the dispersion in performance of the AF control by the lens 1 can be suppressed, allowing a satisfactory AF control, so that a satisfactory AF control uniform to various interchangeable lenses can be performed.
Inventors:
OTA SEIYA
MABUCHI TOSHIAKI
MABUCHI TOSHIAKI
Application Number:
JP4365791A
Publication Date:
October 06, 1992
Filing Date:
March 08, 1991
Export Citation:
Assignee:
CANON KK
International Classes:
G02B7/08; G02B7/28; G03B7/20; H04N5/232; (IPC1-7): G02B7/08; G02B7/28; G03B7/20; H04N5/232
Attorney, Agent or Firm:
Keizo Nishiyama (1 person outside)