Hey Matt, Got a gear question for you. I need a lighter weight set up for stomping around in the backcountry or paddling the kayak. What results have you (or others on this forum) had with a Sony e-mount APS sensor camera body using either the FE 100-400mm or FE 70-200mm? Does it compare well with cropped images taken with the FF bodies such as the A1 or A7R4? I'm really hoping using a body such as the Sony a6600 with a full frame telephoto to save space and weight plus it will keep me smiling. Tom L. *Will Sony be sharing a new APS with bird-eye focus, soon?