Detektor für den Blendenmaximal- und Minimalwert eines Wechselobjektivs

摘要

A detector for the maximum/minimum diaphragm adjustment value of an exchangeable lens, comprises a bar code 22 on the lens, in which the maximum/minimum diaphragm adjustment value of the lens is printed in an binary code by thick line and thin line, at the part which the lens is joined with a camera; and a bar code reader 24 to output to the camera an electric pulse signal corresponding to the bar code perceived.