If you love the portability and ease of use of a ttl flashgun but desire more effective filling light without the hassle of a studio kit then profotos b2 off camera flash system is a solution worthy of your consideration only 10cm round and deep the b2 is powered by an external battery pack and the system is light and slight enough to carry with you red carpet wedding event and on location photographers will love the flexibility and power offered by the b2 it will revolutionise both y