The Sevenoak follow focus SK-F03 is a simple but usefull focus and zoom controller designed specifically for DSLR cameras. With its adjustable diameter SK-F03 it is suitable for almost any DSLR lens. You can use the SK-F03 to control the focus or the zoom. The SK-F03 is very simple and easy to use. The compact design is lightweight and ensures that you can always take it with you.