FocusShifter will fit any lens that is between 56mm and 98mm in diameter.
Yes, LensShifter works with both prime and zoom lenses. With zoom lenses, you can use one color for focus, and the other for zoom.
The belt is made from industrial strength fiberglass reinforced neoprene, with a pattern of grooves on the inside. The only way it will break is if you intentionally cut it with a knife. It is very strong.
The belt grips tightly to the focus or zoom ring, and there is no chance of slip. The tension can be adjusted to your liking. The belt has grooves in it that match the pattern of grooves on the focus/zoom ring. This provides a non-slip connection.
LensShifter is for video and photography, FocusShifter is designed primarily for video.
LensShifter is streamlined with only the handle and counterweight.
FocusShifter is a full featured Follow Focus, with marker board for focus points and hard stops, while LensShifter doesn’t have the arrow used to line up focus points.
LensShifter adds very little weight to your camera, especially when used without the balance counterweight.
Total Weight = 2.14 ounces (60.7g)