Practically speaking: 39 pt. vs. 51pt AF

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ralittle2
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Practically speaking: 39 pt. vs. 51pt AF
3 months ago

I realize that this may seem a dumb question, but I would appreciate understanding the differences between a 39pt vs. a 51 pt AF when you are using either 9 or 21 pt AF.  For that matter, when I'm shooting in 9 or 21, there must be a difference between lesser focusing systems.

I shoot kid's sports, my kids, and usually shoot in either 9 or 21 pt.  It seems to be commonly accepted that the 51pt is better than a 39 pt AF, but if someone can give me a simple explanation or send me to a source then I'd appreciate it.  TIA.

 ralittle2's gear list:ralittle2's gear list
Nikon D300S Nikon D750 Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II Sigma 150-500mm F5-6.3 DG OS HSM Nikon AF-S Nikkor 50mm f/1.8G +1 more
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