Sevenoak SK-F03 is a simple but useful focus and zoom controller designed for most DSLR cameras. Designed with adjustable diameter, SK-F03 is compatible with almost any DSLR lenses and fits for most DSLR cameras. SK-F03 can be used for controlling both the focus and zoom, it is very simple and easy to operate, and make your whole video kit much lighter. With the compact and lightweight design, you can carry it anytime and anywhere.