The ornamental design for a camera, as shown and described.
FIG. 1 is a perspective view of a camera showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a front elevational view thereof, in the closed position; and,
FIG. 8 is a perspective view thereof, in the closed position.
Portions in broken lines are for illustrative purposes only and form no part of the claimed design. Dot-dash broken lines define the boundaries of, but are not included in, the claimed design.