The ornamental design for a camera, as shown and described.
FIG. 1 is a rear perspective view of a camera;
FIG. 2 is rear view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is a top and front perspective view thereof, shown in condition of use with a pair of eyeglasses disclosed in broken lines to illustrate an environment;
FIG. 6 is a front view thereof;
FIG. 7 is a rear view thereof;
FIG. 8 is a side view thereof;
FIG. 9 is a bottom view thereof; and,
FIG. 10 is a top view thereof.
The broken lines depict portions of the camera in which the design is embodied that form no part of the claimed design. Additionally, the broken lines showing a pair of eyeglasses in FIGS. 5-10 represent environmental structure and form no part of the claimed design.