Here’s a head shot of an adult Bald Eagle made with the Sony Alpha a9 II Mirrorless camera & Sony FE 200-600mm f/5.6-6.3 G OSS Lens. The edge to edge sharpness is as impressive as the Sony 600mm f/4 GM OSS Lens.
American Bald Eagle Portrait (Hailiaeetus leucocephalus, Pygarge a tete blanche, BAEA) from my BALD EAGLE WORKSHOP in Kachemak Bay (near Homer), Alaska. Image Copyright ©Christopher Dodds. Sony Alpha a9 II Mirrorless camera & Sony FE 200-600mm f/5.6-6.3 G OSS Lens @590mm ISO 640, f/22 @ 1/400s Manual exposure.