The ornamental design for a camera, as shown and described.
FIG. 1 is a top, front and right side perspective view of a camera showing our new design;
FIG. 2 is a bottom, rear and left side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is an enlarged view of portion 9 shown in FIG. 3.
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 enclosing an enlargement portion of the design forms no part of the claimed design.