WayneF Offline Upload & Sell: Off
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I don't have the 70-200 f/4, but it is lighter than the 24-70 which does not have a tripod foot.
70-200 f/4, 1.87 pounds, 7 inches long
24-70 f/2.8, 2.35 pounds, 6 inches long
I don't think it is about strain on the mount, but the lens mount would better balance it. For example, if the 24-70 is turned up on its side for a portrait view, it can be too heavy to not slip hanging on the side of a pan head tripod screw (speaking from experience, it can rotate around the screw, and sag down).
But a L bracket on the camera would mount it on top (instead of hanging over the side), and would prevent that slip.... which is the same idea as the lens mount... which mounts on top directly above the tripod head, standing on flat base, no tripod screw for the weight to rotate around and sag down.
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