This is a review of the Profoto B10 AirTTL OCF Flash Head, a lightweight, portable and battery-powered flash designed for professional portrait photographers. Although Profoto had previously released battery-powered flash heads for on-location work such as the B1 (see our Profoto B1 Review), B1X and B2, they were all either too big and heavy, or small enough to require an external battery pack. The Profoto B10 was designed to strike a perfect balance of portability, power and weight, so it…