1.Compatible for and other DSLR Camera Camcorder DV Video; Fits industry standard 15mm rod mounts and 60mm center to center distance 2.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: Focus Application: Lens smaller than 85mm Maximum load: 2-5 kg Product weight: 0.2 (KG) size:17.5x12.5x8CM Material:Aluminum alloy colour: Yellow + Black Package Contents: 1 x Focus 1 x focus ring Only 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.