Nikon D780 - Varying Focus over a Series of Photos (Focus Shift Shooting)

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Other Shooting Options
Use the [Focus shift shooting] item in the photo shooting
menu to vary focus automatically over a series of photographs.
This feature can be used to take photos that can later be copied
to a computer and combined using third-party focus-stacking
software.
Varying Focus over a Series of Photos
(Focus Shift Shooting)