Buy on Amazon.com : http://www.amazon.com/gp/product/B00GGJ18NM?tag=catfoodrevi0a-20 <br /> <br />Profoto B1 500 AirTTL Battery Powered Flash <br /> <br />The B1s patent-pending technology fully integrates the flash head with your Canon camera The integration is so complete that Profoto sometimes refers to the B1 as an off-camera flash The key to this control is the Air Remote TTL-C <br />It has 8 frequency channels with 3 groups per channel and a range of up to 330 for TTL triggering Each channel has power ratio capability of - 2 stops in TTL or - 9 stops in manual Modeling light shut-down of the unit and first or rear curtain exposure can also be selected <br />The B1s Lithium-ion battery gives you up to 220 full power flashes and thousands of minimum power flashes on a 2-hour charge from the provided 28A multi-voltage charger An optional 45A quick charger shortens that time to 1 hour <br />In Normal Mode which prioritizes color fidelity the B1 500 AirTTL is capable of t05 flash durations of 111000 sec at minimum power and 11000 sec at full power <br />Freeze Mode automatically selects the shortest flash duration possible at the user-selected power level Motion-stopping flash durations of 119000 at minimum power make the B1 500 AirTTL ideal for high speed shooting
