ARCA-compatible NOVOFLEX focusing racks are indispensable accessories for macro and stereo photography. They can be mounted on any tripod and on the NOVOFLEX MS-REPRO macro reprostand. The CASTEL-QP comes with Arca size dovetail clamping and was designed to fit the NOVOFLEX Q=quick-release system. It can also be mounted on any tripod head with 1/4” or 3/8” thread Or directly on the quick release untis Q=BASE II or Q=MOUNT. If finer settings of the slider are desired for Focus Stacking, is as an accessory the fine drive CAST-FINE available A second focusing rack converts the CASTEL-QP into a cross focusing rack of exceptional stability (see CASTEL CROSS). Technical specifications: Dimensions: 200 × 100 × 33 mm (7.9 × 3.9 × 1.3”) Glider width: 66 mm (2.6”) Weight: 382g (0.8 lbs.) Travel: 140 mm (5.5”) Tripod connection: 3x 1/4 "-3/8" thread pairs and NOVOFLEX Q profile (ARCA-UniQ / C compatible) Camera connection: NOVOFLEX Q-profil (ARCA-UniQ/C-kompatible) Adjustment range with a complete rotation of the drive wheel: 15mm (0.6") Camera connector pieces (Q=Plates) not included.