The zoom head covers focal lengths of 24-200mm, and it is at the 200mm that the quoted GN60m@100 ISO has been measured. The unit has been designed to be small so that it will be attractive to owners of compact system cameras - it measures 98x73x112mm and weighs 300g without batteries. Manual control allows 1/3-stop increments from full power to 1/256th, and auto exposure compensation is available up to +/-2EV.