I was tracking this bird when it took off in flight. Fortunately, I had already acquired focus while the bird was still in the water, and the distance did not change much.
Camera: Nikon D800
Lens: Nikkor AF-S 28-300mm f/3.5-5.6G ED VR
ISO: 360
Focal Length: 300mm
Aperture: f/5.6
Shutter: 1/1000s