| 摘要 |
PURPOSE:To correctly transmit the focal distance information of an interchangeable lens to a camera body side, by properly correcting the focal distance information of the interchangeable lens in accordance with the magnification of a conversion lens. CONSTITUTION:The protruding quantity of the signal member 12 of an interchangeable lens 10 is transmitted to the input branch 17a of a camera-side lever 17 after it is magnified M times by an intermediate lever 31 provided in the body tube section of a rear conversion lens. The intermediate lever 31 is supported by a pin 32 under a slidable condition and forced to move leftward by a spring 33. In such way, the focal distance information of the interchangeable lens 10 is transmitted after it is magnified M times between the input branch 17a and intermediate lever 31 through the rear conversion lens whose magnification is M. Therefore, the difference between the protruding quantity of the signal member 12 when the interchangeable lens 10 is provided with no rear conversion lens and the protruding quantity of the intermediate lever 31 when the lens 10 is provided with the rear conversion lens becomes equal for any interchangeable lenses. |
