The present digital camera system includes a camera body and an interchangeable
lens barrel. The camera body contains an image pickup device with an imaging range
Ri, and the interchangeable lens barrel is removably attached to the camera body.
The mount opening portions of the interchangeable lens barrel and camera body includes
openings equal to or larger than a square opening range Rm formed by connecting
ends of segments Sd tilted outwardly from the four corners of an imaging range
Ri diagonally to the outside by 12 degrees to 14 degrees and extended to a flange
back FB position. The circumscribed circle diameter Dm of the mount opening portion
is 1.8 times or larger of the circumscribed circle diameter Di of the imaging range
Ri. The digital camera system can provide an interchangeable lens and digital camera
body reducible in size without deterioration in amount of peripheral light.
