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A camera system includes a camera body and an interchangeable lens. The camera body includes a camera-side mount, a groove which is disposed in rear of a mount abutting face of the camera-side mount in the direction of the optical axis and which is formed on an outer circumference of the camera-side

A camera system includes a camera body and an interchangeable lens. The camera body includes a camera-side mount, a groove which is disposed in rear of a mount abutting face of the camera-side mount in the direction of the optical axis and which is formed on an outer circumference of the camera-side mount, and a ring-shaped elastic member which is disposed in the groove. The interchangeable lens includes a lens-side mount which is mountable on the camera-side mount, and a tubular protruding part which is disposed in rear of a mount abutting face of the lens-side mount in the direction of the optical axis and which has an inner circumferential face arranged to come into pressure contact with the ring-shaped elastic member.

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A camera system comprising: (a) a camera body including: (a-1) a camera-side mount; (a-2) a groove which is disposed in rear of a mount abutting face of said camera-side mount in the direction of an optical axis and which is formed on an outer circumference of said camera-side mount; and (a-3) a rin

A camera system comprising: (a) a camera body including: (a-1) a camera-side mount; (a-2) a groove which is disposed in rear of a mount abutting face of said camera-side mount in the direction of an optical axis and which is formed on an outer circumference of said camera-side mount; and (a-3) a ring-shaped elastic member disposed in said groove; and (b) an optical accessory including: (b-1) an accessory-side mount which is capable of being coupled with said camera-side mount; and (b-2) a tubular protruding part which is disposed in rear of a mount abutting face of said accessory-side mount in the direction of the optical axis, said tubular protruding part having an inner circumferential face which is capable of being brought into pressure contact with said ring-shaped elastic member.