The Fine Adjustment Handle for Castel by Novoflex is an extension handle for fine focus adjustment of the Castel-L and Castel-Q focusing racks. The Castel focusing racks are used in macro and stereo photography to ensure correct framing and the sharpest focus possible. The extension handle not only offers smooth control of the fine focus, but brings the hand away from the rack and the camera, helping to eliminate accidental bumps and providing better motor control of your hand as it adjusts the focus.