Photographing apparatus and photographing control method

1. A photographing apparatus comprising:

an image sensor, which converts an object image that is formed by a photographing optical system into electrical pixel signals, and includes a plurality of color filters;

a movable-member driver configured to move a movable member in a direction that is different from an optical axis of said photographing optical system, wherein said movable member includes at least one of an optical element, constituting at least one part of said photographing optical system, and said image sensor;

a drive controller configured to control a driving of said movable member to move in a predetermined circular path via said movable-member driver; and

a processor configured to select a drive diameter D of said predetermined circular path by which said drive controller controls the driving of said movable member within a range of the following condition (1):

d *π/(2*2½)≦ D≦d*π/ 2  (1),

wherein d designates a pixel interval of said image sensor.

2. The photographing apparatus according to claim 1 , wherein said processor selects a value of “d*π/(2*2 1/2 )” or “d*π/2” as said drive diameter D.

3. The photographing apparatus according to claim 1 , wherein said processor selects a value of any one of “d*π/(2*2 1/2 )”, d*1.3, and “d*π/2” as said drive diameter D.

4. The photographing apparatus according to claim 1 , wherein said movable member comprises said image sensor,

wherein said movable-member driver is provided with a mount support plate; a movable stage onto which said image sensor is mounted, said movable stage being slidable relative to said mount support plate; a magnet mounted on one of said mount support plate and said movable stage; and a drive coil mounted on the other of said mount support plate and said movable stage, and

wherein said drive controller is configured to control a driving of said movable stage to move in the predetermined circular path relative to said mount support plate by supplying an alternating drive signal to said drive coil.

5. The photographing apparatus according to claim 1 , wherein said movable-member driver is configured to move said movable member in a direction different to that of the optical axis of said photographing optical system to carry out an optical low-pass filter operation in which a light bundle emanating from said object image is incident on a plurality of said color filters, having different detection colors, of said image sensor,

wherein said drive controller is configured to control, via said image-shake correction device, a driving of said movable member to move in said predetermined circular path at the drive diameter D that is selected by said processor so that said object-image light bundle relatively moves on the image sensor in said predetermined circular path at the drive diameter D.

6. A photographing control method, which includes an image sensor, which converts an object image that is formed by a photographing optical system into electrical pixel signals, and includes a plurality of color filters; and a movable-member driver configured to move a movable member in a direction that is different from an optical axis of said photographing optical system, wherein said movable member includes at least one of an optical element, constituting at least one part of said photographing optical system, and said image sensor; said photographing control method comprising:

controlling a driving of said movable member to move in a circular path of a predetermined drive diameter via said movable-member driver; and

selecting a drive diameter D of said circular path by which the driving of said movable member is controlled within a range of the following condition (1):

d *π/(2*2½)≦ D≦d*π/ 2  (1),

wherein d designates a pixel interval of said image sensor.