The ornamental design for a camera, as shown and described.
FIG. 1 is a front, right, and bottom perspective view of a camera embodying the new design;
FIG. 2 is a rear, left, and top perspective view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a front elevational view thereof; and,
FIG. 8 is a rear elevational view thereof.
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 lines denote the boundary of the claim and form no part of the claimed design.