Initially I blamed it to my Tamron 70-210 f/4 for bad calibration but that wasn’t the case, since I had the same issue with the Canon 70-200 f/2.8 and in any case, there was also photos that was razor sharp (let’s say I had 6 out of 10 perfectly focused images).
Very useful article! I like Wildlife photography though I am mostly a seascape photographer. I am totally agree about one shot AF vs AI Servo (I am Canon user, forgive my different terms). For years I used AI Servo along with back button focus for being able to have the best of both worlds BUT, that is very bad for stills! The camera never locks the focus perfectly (though it gives a focus lock signal) even if you release the focus button and that gave me a lot of misfocused images. Initially I blamed it to my Tamron 70-210 f/4 for bad calibration but that wasn’t the case, since I had the same issue with the Canon 70-200 f/2.8 and in any case, there was also photos that was razor sharp (let’s say I had 6 out of 10 perfectly focused images). After a lot of trial and error I tried to use One shot AF and suddenly I had perfectly (9 out of 10) sharp photos, both on OVF and DualPixel AF and even in low light!