Hi,
I use this camera and it is decent in performance wrt wildlife photography. It has good AF performance which is essential for wildlife. Of course it lacks some features of full frame camera like better low light photography, better image quality but it gives you good reach as it has crop sensor. You can see some photos which i have clicked using this camera in my profile. If you are just starting to pick up wildlife photography, then its a good camera to start with. Later when u reach advance level OR if you have budget then u can go for full frame camera.
6100, 6400, 6600 all have same sensor with each having some advantage over previous one.
PS – If you have more budget you can go for 6400 which has weather proof body. 6100 is weather resistant but not weather proof.
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This reply was modified 8 months, 2 weeks ago by Rohit Ketkar.