| 摘要 |
PURPOSE:To eliminate malfunction and unnecessary operation by providing individual photographic lenses with data indicating the degree of influence of harmful light and indicating whether or not focus detection by a photographic lens in use is allowed by the data. CONSTITUTION:When the photographic lens 101 is mounted on a camera body, it is connected to a lens information output circuit LID and a readout circuit RD. When a user touches a shutter button, etc., the contents of the circuit LID are read out and set in registers 318-320. When a zoom lens is used as the lens 101 and a zoom ring ZR is set where there is the influence of harmful light, harmful light data is displayed on a display device 313. Then, when the zoom ring ZR is set where there is no harmful light, the absence of the influence of harmful light is displayed on the device 313. Namely, it is known that active AF is possible. Therefore, when the user presses down the shutter button, etc., illumination light is projected on an object and focus adjustment is made to take a photograph. |
