The ornamental design for a base for a camera mount, as shown and described.
FIG. 1 is a top, front and left side perspective view of a base for a camera mount showing our new design, with the bottom of the base oriented downward with respect to the page;
FIG. 2 is a left side view of the base with the bottom oriented downward;
FIG. 3 is a right side view of the base with the bottom oriented downward;
FIG. 4 is a front view of the base with the bottom oriented downward;
FIG. 5 is a top view of the base with the left side oriented downward;
FIG. 6 is a bottom view of the base with the right side oriented downward;
FIG. 7 is a perspective view of the base coupled to a shirt collar, the perspective view showing the front, the left side, and the top of the base, the left side of the base coupled to a camera mount and the camera mount coupled to a camera, the camera mount obscuring a portion of the left side and the collar obscuring a portion of the top; and,
FIG. 8 is a perspective view of the base coupled to another collar, the perspective view showing the front, the left side, and the top of the base, the left side of the base coupled to a camera mount and the camera mount coupled to a camera, the camera mount obscuring a portion of the left side.
The dashed lines in the drawing show structure of the environment and form no part of the claimed design.