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Chelsea & Tony Northrup review ALL the Sony cameras and lenses to make recommendations for the best wildlife photography. Here's a list of the mirrorless camera gear they discuss in this review:

Sony APS-C mirrorless cameras:
Sony a6000: http://sdp.io/a6000
Sony a6100: http://sdp.io/a6100
Sony a6300: http://sdp.io/a6300
Sony a6400: http://sdp.io/a6400
Sony a6500: http://sdp.io/a6500
Sony a6600: http://sdp.io/a6600

Sony full-frame mirrorless cameras:
Sony a7 III: http://sdp.io/a73
Sony a7R III: http://sdp.io/a7R3
Sony a7R IV: http://sdp.io/a7R4
Sony a9: http://sdp.io/a9
Sony a9 II: http://sdp.io/a92
Sony a1: http://sdp.io/a1

Sony wildlife lenses:
Sony 70-350: http://sdp.io/s70350
Tamron 150-500: http://sdp.io/t150500
Sony 200-600: http://sdp.io/s200600

Canon EF to Sony FE lens adapter:
Sigma MC-11: http://sdp.io/mc11