Thanks so much. I am a bit confused though. You indicate that you use 51 points, but you then go on to say you use either single point for perched, hunting and fishing subjects, but 9-point AF for BIFs. When do you use 51 points?
Also, I finally figured out that I can set the camera for 51 point AF (via the AF button and sub-command dial) but set the multi-selector to scroll only 11 points (a6) It can also be set to scroll all 51, but these are the only two options in a6, you can not set it to scroll 9 and 21 points. I'm thinking that this may be the best of both worlds in terms of capturing quick AF.