aezoss wrote in post #17986204
For high school rugby my 7D2 + 100-400 II or 70-200 II comes in around 60-70% usable frames in a burst at 400mm f/5.6 1/1000 - 1/2000. The other 30-40% are either misses due to shallow DOF (wrong player, AF point landing somewhere other than chest/face) or what looks like motion blur from hand holding beyond what IS can compensate for. On players moving parallel to the sensor it's possible pan rate is introducing some blurring. I try to track a player for a few steps before hitting the shutter. When the AF system isn't locked it's pretty obvious.
Lens: focus limiter 2.5m/3m to infinity, stabilizer mode 2.
Body: Tracking sensitivity -2, Accel/Decel tracking +2, AF pt auto switching +2, 4 or 8 pt expansion, 1st/2nd image priority focus. Back buttons AF-ON configured for one shot, * for servo. Constantly checking with my thumb that I'm on the right button. I get better stationary subject results with one shot. Servo seems to get weird with stationary subjects from time to time.
I'll switch the tracking sensitivity to +2 periodically to allow the AF system to move from player to player faster if the game calls for it. I try to choose a single player to follow for a while, get a shot or two and move to the next.
Tracking sensitivity -2, Accel/Decel tracking +2, AF pt auto switching +2. Art Morris talks about doing better than Canon and suggests those numbers in one of his 7D2 birding setup videos. He sets Case 3 up that way because he does not use it for anything else. I set case 3 that way as well but have not tried it yet.
I like to use zone 65 point AF and Case 6 if there are not too many other distractions. Setting up the initial AF point helps lock and track the subject and the 7D2 does remarkably well at this. Even without initial AF point it isolates the closest object well. TS at -2 helps to ignore other players. Typically 4 or 8 point expansion gives you total control instead of the computer. Here is an example of bird that the 7D2 tracked well in 65 point zone.
Even here it tracked the BIF
This is at the end of a burst sequence. By the way I set my FPS to 8 just to eliminate any potential issues.
Maybe try zone or large zone some day. Note: Both those do not have an initial AF point option but the AF cluster is small.