| 摘要 |
A diaphragm 12, a variable ND filter 13, and an exposure controlling unit 17 which controls an aperture value of the diaphragm 12 and a transmittance of the variable ND filter 13 in accordance with a brightness of a photographic subject are provided. When the exposure controlling unit 17 changes the diaphragm in a predetermined range, the exposure controlling unit 17 also changes the transmittance of the variable ND filter 13 so as to perform an exposure control and, after obtaining a proper exposure by changing both the aperture value and the transmittance, sets the aperture value after exposure control to Fa. In a case where the aperture value at which a maximum resolving power is obtained is set to Fb, when a condition, Fa ‰ Fb, is satisfied and the transmittance is neither the minimum nor the maximum, the exposure controlling unit brings the aperture value close to Fb and changes the transmittance so as to maintain the proper exposure after the exposure control. |
