1: 7D Mark II AF is indeed remarkable. 2: Having the ability to zoom out for flight photography. 3: The new Canon EF 100-400mm f/4.5-5.6L IS II USM lens will have two primary uses: a: hanging on a Black Rapid RS-7 strap as an auxiliary intermediate flight lens for folks toting big glass. b: as the main lens of folks who can not afford or carry one of the super-telephotos. 4: The Canon EF 100-400mm f/4.5-5.6L IS II USM lens in combination with the Canon EOS 7D Mark II will further revolutionize bird photography opening up a new world to both beginning bird photographers and birders curious about photographing birds.