A guiding scope camera or spotting scope can be mounted on the Fine Adjustment Unit with the 1/4 -20 bolt for precise up-and-down and side-to-side slow motion control. It s a heavier duty unit than the regular fine adjustment unit. Can be mounted on a camera tripod telescope our large accessory plate -- anywhere a 1/4 -20 accessory can go. Weight 14 ounces boxed 4 x 3.75 x 2.5 inches