Specifically made to fit the Samyang 100mm F2.0 Lens. This clamp comes pre-assembled with stainless steel nuts and bolts, ready to be mounted to your lens with no tools required. 2x thumbscrews secure the bracket to the lens and a third is used to adjust the camera focus. A full turn of the focus knob equates to moving the focus ring 0.7mm giving you much finer control over the focus than manual adjustment. It also functions as a focus lock, should you, or any cables accidentally catch the focus ring, this device will hold the focus steady.

This clamp limits your focusing range but you can simply release the lower thumbscrew to allow manual movement of the focusing ring.

Listing is for the focus adjuster only, any other items - camera, lens etc are included only for reference