This helicopter flew over the Hudson River while I was testing the Canon EF 1200mm f/5.6 L USM Lens. It looked like a good subject. Had I more time, I would have change the shutter speed to about 1/500 to get more motion blur from the blades.
Camera and Lens Settings
1200mm f/11.0 1/1250s ISO 1250 5616 x 3744px