The ornamental design for a lens for camera, as shown and described.
FIG. 1 is a front, top, right perspective view of a lens for camera showing the new design;
FIG. 2 is a rear, top, left perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a plan view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a right side view thereof; and,
FIG. 8 is a left side view thereof.
The evenly spaced broken lines shown in the drawings depict portions of the lens for camera that form no part of the claimed design. The long-short broken lines depict the boundary of the claim and form no part of the claimed design.