I watched for several minutes as these two pelicans fought over a carp. The one in front finally one. Camera settings were 1/800 sec., f/13, ISO640, focal length 600mm. Equipment included Nikon D750, Nikkor 200-500mm lens, TC-14E III teleconverter, Induro Stealth CLT403 tripod, Wimberly WH-200 gimbal head