| 摘要 |
PURPOSE:To eliminate the manual switching of the photometric distribution for a TTL photometric camera, by reducing the photometric sensitivity at the upper side within a photographing viewfield interlocked to the operation to decrease the focal distance. CONSTITUTION:A fixed lens barrel 17 which holds an eccentric lens is turned along a groove 171 of the barrel 17 by a zoom lever 19 and a cam ring 18. A known zooming cam groove is provided to the ring 18. A variator lens 2 and a compensator lens 3 are displaced by the ring 18 to vary the focal distance. At the same time, a cam groove 181 is provided to the ring 18, and the depth of the groove 181 varies gradually according to the rotation of the ring 18. The tip part 161 of a switching member 16 of photometric distribution is fitted into the groove 181. The member 16 is moved up and down as shown in the diagram by a slit 163 provided at a part of the member 16 and a pin 26 of the camera main body and in accordance with the depth of the groove of the member 16. |
