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IME the recommendation for "3D" in AF mode for ACTION is a very poor choice as well as those a3 and a7 settings!
Nice of you to post, however...for those out there that may need some basic help starting to configure their D8's
Thanks for the feedback. I have found that 3D AF mode works relatively well for dogs running around in a fenced area. It's not the best setting for other types of action shooting, especially things that move faster (eg: BIF). AF settings are something I change often depending on the situation, but 3D does work well in connection with the focus tracking set to "long" (a3).
For a7, number of focus points set to 51 is not really a disadvantage over choosing 11. When using a dynamic area like 3D I find that I usually start with just the center point anyway, often locking it on that so it doesn't move except when it starts tracking. For my shooting style, this setting is actually irrelevant.