Nikon D4 User Manual download pdf (Page 47)

Autofocus Tips

Checking Focus

Position a ruler at an angle so that one of the rules is at the

same distance from the camera as a vertical surface such as

the cover of a book stood upright. Using autofocus, focus

on the vertical surface and then photograph the selected

rule using focus lock.

The illustration below shows how to interpret the results.

Camera focuses in

front of selected

rule: adjust  ne-

tuning upward.

Camera focuses

on selected rule:

no adjustment

required.

Camera focuses

behind selected

rule: adjust  ne-

tuning downward.

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Nikon D4 User Manual Page 47