The ornamental design for a camera, as shown and described.
FIG. 1 is a top, front and side perspective view of a camera showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a side elevational view thereof from the left of FIG. 2;
FIG. 7 is a side elevational view thereof from the right of FIG. 2; and,
FIG. 8 is a top, front and side perspective view thereof, with the signaling light guide, indicator disk and light reducing panel shown in a lower position.