I claim the ornamental design for a camera, as shown and described.
FIG. 1 is a front perspective view of a camera showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof, showing the display screen of the camera in an open position; and,
FIG. 9 is a rear perspective view of the camera with the display screen shown in a closed position.
The broken lines depict portions of the camera in which the design is embodied that form no part of the claimed design. Additionally, the dot-dash lines denote the boundary of the claim and form no part of the claimed design.