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Hey all, I need some advice. I have been taking photos now as a job for about 8 months. I work as a photography guide in Rocky Mountain National Park. I love my Sony A7II that I bought with the 28-70mm kit lens on sale for $900. After that i needed a wildlife lens so I picked up the Sigma 100-400mm f5.0-6.3 DG DN. Now that I have learned most of the basics of photography I feel that my camera and maybe my lens is holding me back when it comes to my wildlife shots. I take mainly shots of elk and moose and relatively stationary animals. I have recently been very interested in photographing birds in flight and specifically birds of prey like osprey and falcons. The last time I was out I was lucky enough to shoot an osprey hunting on Sprague Lake in RMNP but my camera felt so upsettingly slow to focus on the osprey with how low the light had gotten and how fast it was going in its dives. look at the EXIF for my settings if you think that was the problem. This was the best shot I was able to get out of all of my tracking shots. the rest of them are either out of focus or unusably noisy due to light. So my question is, what camera should I be looking into for an upgrade? Sony a7III, a7RIII, a7RIV, A9 and also do you think I should be looking into the Sony 200-600mm G lens or is my sigma 100-400mm more than enough?
