With dual gearing and the integrated Q=Base Arca-Swiss type quick release system, the Novoflex Castel-Q Focusing Rack is an invaluable tool for any macro photographer. 5.5" of total movement is available, and the entire assembly can be attached to either a conventional tripod head or an Arca-Swiss compatible quick release clamp (made by Arca-Swiss, Foba, NPC, Gitzo & others).
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What is there to say? It's just fantastic. I own three other brand focusing rails, and this one, by far, outshines them all. The focus knob located on the side is very accessible and turns very easily and accurately. The smaller knob on the other tightens the position. The ARCA type adjustment on the rear easily secures the camera to the rack. I have found it is easier to loosen and tighten when it is at the rear of the rack. Buy it, you'll like it.
This rack is a pleasure to use for macro work. There is wonderfully little vibration evident even at high magnification. The lock must be engaged to hold position with a heavy rig when much off horizontal, but the ergonomic design makes that easy to do.