These were at the Wallkill River NWR. Canon 1d mark III, 500 f4, 1.4x II extender, iso 400, F10, 1/200 from a tripod with 580EX attached to body, flash set at manual, high speed sync, 50mm,+2. The shot was at minimum focus of 14 feet and slight crop from full frame vertically.
Lovely capture, and good crop here. It's both a nice image of the 'flies, and a nice graphic with the stiff but angled branch and the curving details of your subjects. Nice job!