This picture was taken handheld while sitting on a bench.
This image was straight from the camera, cropped at 25 percent, resized to 1800x1200, no other post processing was done.
Camera: Nikon D3300
Aperture Priority, 1/640, F6.3, ISO800, 600mm, 0.0EV
Colour: Standard (default settings), Active-D: Off, Distortion Control: Off, Noise Reduction: Off.
Lens: Sigma 150-600mm Contemporary
Motor's Drive Speed-Priority AF, Dynamic View Mode OS.