1.Compatible for and other DSLR Camera Camcorder DV Video; Fits industry standard 15mm rod mounts and 60mm center to center distance2.It can be easy to mount and take down; Using gear drive can adjust camera focus in a more accurate and way.3. gear ring belt is suitable for less than 100mm diameters lens.4.Non- with grooved knob; The white ring is made of plastic and it can be used to the scale on focus.5.It is great for focus .Product Type: FocusApplication: Lens smaller than 85mm Maximum load: 2-5 kgProduct weight: 0.2 (KG)size:17.5x12.5x8CMMaterial:Aluminum alloycolour: Yellow + BlackPackage Contents:1 x Focus1 x focus ringOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.