The ornamental design for a camera, substantially as shown and described.
FIG. 1 is a front perspective view of a camera showing our new design;
FIG. 2 is a rear view of the camera shown in FIG. 1;
FIG. 3 is a front view of the camera shown in FIG. 1;
FIG. 4 is a top view of the camera shown in FIG. 1;
FIG. 5 is a bottom view of the camera shown in FIG. 1;
FIG. 6 is a left side view of the camera shown in FIG. 1; and,
FIG. 7 is a right side view of the camera shown in FIG. 1.
The broken line showing of the camera base and other features is included for the purpose of illustrating environmental structure and forms no part of the claimed design.