The ornamental design for a camera, as shown and described.
FIG. 1 is a front top perspective view of a camera showing our new design;
FIG. 2 is a rear bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is an enlarged view of the encircled portion 9 indicated in FIG. 1.
The evenly dashed broken lines depict portions of the camera that form no part of the claimed design. The unevenly dashed broken lines in FIGS. 1 and 9 indicate the area shown in the enlarged view in FIG. 9 and form no part of the claimed design.