TheFine Adjustment Handle for CastelbyNovoflexis 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 offerssmooth control ofthe fine focus, butbrings the hand away from the rack and the camera, helpingto eliminate accidental bumps and providing better motor control of your hand as it adjusts the focus. <br /> <br />