| 摘要 |
PROBLEM TO BE SOLVED: To provide a camera which enables a user to recognize whether or not an optical filter is loaded, and to recognize the type of the loaded optical filter. SOLUTION: Pieces 35b to 35c to be cut in accordance with the optical path length difference of the optical filter 31 in terms of air are arranged on the filter frame 31 of the filter unit FU loaded in the loading part 40 of the camera 30 while contacts 43a to 43d and a GND contact 44 are arranged in the loading part 40, when the filter unit FU is loaded in the loading part 40, the contacts 43a to 43d are brought into contact with a conduction pattern arranged in the pieces 35b to 35c. And the optical path length difference of the optical filter 31 in terms of air can be distinguished in accordance with the state where the contacts 43a to 43d are connected or not connected to the GND contact 44 when the filter is loaded. |
