Donald Chin

Performance is not my only priority, sometimes I do have to consider weight. :-)

I think you should buy a 80D and use it with the Sigma for birding.

I got nothing to say if you even do understand tilt screen is LV only! ;-)

You better stay with your XT1, D500 LV AF is not fast enough for action.

I don't think you've ever used SnapBridge in the field. ;-)

300/2.8 VR (first version) is my choice, 200~400/4 is something like T5 in real world, not great for low light night sports.

Wireless transfer is slow and power hungry, regardless of using bluetooth or wifi, adding the grip with EN-EL18a is recommended.

As far as I know you can only transfer selected photos via WiFi.

But the point is the iOS version of SnapBridge is not available yet, at least at this moment. :-)

It's all inclusive.