Nikon Z7 Autofocus: Recommended Protocol for Best Focus (static subjects), Plus When It Fails
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Precision focusing is critical for maximum sharpness for many subjects even well stopped down, but it is particularly important to start an automated focus stacking series. This page discusses the best practice, and shows when it can fail (and thus when manual focus is required):
Nikon Z7 Autofocus: Recommended Protocol for Best Focus (static subjects)