The ML-L3 has an extremely limited range of 5m (16ft.) max. compared to the ML-3's range of 8m (26.2ft.) can be extended to 100m using an ML-2 transmitter. The Pro bodies can also be used with RF triggers with ranges up to 1600ft. (Pocket Wizards) without relays and even longer using relays. Good Luck and Enjoy your Nikons!