Osceola County, FL - 1D4, 500mm, hand held from boat, 1/3200, F5.6, ISO 800, manual exposure
The only way to get the Tree Swallows large in the frame with the 500mm is to set the focus limiter to the close setting. This means you must prefocus and then never focus on anything but the bird. If you miss you are done until the next Tree Swallow flies by close. I clipped a wing on this one, so I cropped the other to match.