David Arbogast wrote in post #17908441
It would be "groovy" if I could be a bit clearer regarding what I would prefer (ergonomically).
On the back of the camera there is a groove built right into the body for your thumb, yet the available buttons for bb focus are all to the right of that ergonomic groove. I want a button aligned with the groove at my thumb tip...so I can continuously keep my thumb in the groove where Canon designed it to be.
That would certainly be an improvement over what they have now, but I am not sure that I really ever want to have AF and shutter separated; hence, my two-shutter-button approach. The instant you realize that AF is not going to happen fast enough, you simply switch to the shutter button that isn't tied to AF. Very fast and intuitive. Much faster than turning the AF switch off on the lens, and then back on again when needed, or pressing the "AF stop button" on the lens which isn't near where I comfortably hold the lens, and only works until you press the shutter button again. There's no way that once you got used to the two-shutter-button approach that it wouldn't be faster and result in less wasted time. The choice will become transparent in no time; you don't have to remember if the AF is on or off because it is always both on and off. The AF switch on the camera leads to a lot of disaster, IME, which would never happen with two shutter buttons.
Of course, manual override that actually worked would be helpful, too. My 400 DO II IS does not have manual override until AF is already verified! What genius requested that feature from Canon, I wonder? At least on my classic 100-400, I had manual focus override until I released the half-shutter press. The 400 DO II IS immediately tries to AF again as soon as I find manual focus, when I try to override hunting.