How to lock focus in-studio once and just shoot?

[KmH]

Make sure that at f/11 you're not losing focus sharpness due to diffraction.
Diffraction Limited Photography: Pixel Size, Aperture and Airy Disks

 

[greybeard]

So I typically lock focus once, then switch the button near the lens from Auto Focus to Manual, and then fire away shot after shot so I don't have to lock focus for every shot even if the subject moves slightly away from the Single-Servo focus point. Is this the norm?

Oh, my! That is way too much work! Way too complicated!

Unlike my original D750, the D810 has both an "AE-L/AF-L" and "AF-ON" button on the back. Is there a way to use the "AE-L/AF-L" to lock and hold focus, so that I can just fire away? (Menus only show a "lock and hold" for exposure with this button and not for focus. Hmmm.)

Just wondering if I'm doing this right, or (most likely) if there's a better way that I'm not doing when shooting in-studio. Maybe people in studio use a focus group instead of AF-S Single? I'm pretty sure I'm not doing it the ideal way.

Check out some instructional videos online about how to use back-button focusing.

Here's one, but I've watched several that are worse than no help at all.



Another one:



And another one:

Back button focus, I like it