Canon Community

I use an EOS R. My question is about Back button focus. After selecting a point and with servo focus mode how long will the focus remain on the point selected.? For example, a person on a bike riding towards me. I use BBF on them when they are 50 fee...

 I did a shoot last night with my EOS R of a dance performance. 12,800 ISO with a 70-300 Canon lens. In almost all of the vertical images and many of the horizontal images I got what I will call "banding lines" in the shot. It was LED theatrical ligh...