The compact, yet powerful, nissin i60a flashgun has a guide number of 60m at iso 100 200mm'. '.strtoupper('t')he zoom head covers focal lengths of 24 200mm, which can be expanded to 16mm with the built in wide angle diffusion panel'. '.strtoupper('i')t is powered 4 aa batteries, which will provide 220 full power bursts, and there is also a power socket for using external battery packs'. '.strtoupper('f')ollowing the success of the popular nissin i40 flashgun, the nissin i60 flashgun has wireless slave ttl functionality, which can be controlled by another nissin flash unit or by the air 1 commander unit'. '.strtoupper('i')t can also control three groups of flashes in its role as a commander'. '.strtoupper('w')eighing just 300g, this versatile, pocket sized flashgun is an ideal accessory for your sony compact system camera.