Patent ID: 7435020

Claim:
A camera body of digital camera to which an interchangeable lens having a predetermined image circle is removably mounted, the camera body comprising: an image pickup device having an imaging surface of an imaging range with a predetermined aspect ratio, the image circle being set larger than the imaging range to include the imaging range therein; a mount portion to which the interchangeable lens is mounted; an opening portion having an opening for allowing luminous flux from the interchangeable lens to pass through, being located at a position spaced from the imaging surface by a predetermined distance; and wherein the size of the opening of the opening portion is equal to or larger than a square formed by connecting ends of segments tilted by an angle θ with respect to an optical axis diagonally from four corners of the imaging range and extended to the opening of the opening portion, and the angle θ satisfies: 12 degrees<θ, wherein the distance between the opening of the opening portion and the imaging surface, herein referred to as flange back (FB), is: 35 mm<FB<50 mm.