The ornamental design for a camera, as shown and described.
FIG. 1 is a front perspective view of a camera showing our new design.
FIG. 2 is a rear perspective view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a bottom plan view thereof.
FIG. 5 is a front elevational view thereof.
FIG. 6 is a rear elevational view thereof.
FIG. 7 is a left side elevational view thereof; and,
FIG. 8 is a right side elevational view thereof.
Stippling and tangency lines in the drawings represent the three-dimensional contours of the design, and are not intended to indicate surface decoration. The broken lines depict portions of the camera in which the design is embodied that form no part of the claimed design.