The ornamental design for a camera, as shown and described.
FIG. 1 is a top and front perspective view of a camera showing our new design;
FIG. 2 is a bottom and front perspective view thereof;
FIG. 3 is a top perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a top view thereof;
FIG. 9 is a bottom view thereof; and,
FIG. 10 is an enlarged view of portion 10 shown in FIG. 4.
The broken lines depict portions of the camera in which the design is embodied that form no part of the claimed design. The dot-dash broken lines encircling an enlargement portion of the design forms no part of the claimed design.