This small flock of Greater Snow Geese was spooked and scattered horizontally in front of my camera.
Because of shallow depth-of-field due to a telephoto lens with tele-extender, the hard thing is to focus on one bird only and hope that it is in the front plane of the mass.
Canon 5D Mark III with the 500L f4 lens with 1.4 Extender II handheld @ 1/1000, f13, ISO 400, - 1/3 exposure compensation. No crop.
Because of my bad knees, I try to find spots where I can basically sit for very long periods of time not far from my vehicle. The Greater Snow Goose migration stop at Victoriaville, Québec is one such spot with anywhere from 100 to 120 thousand geese present.
Cheers,
Mike