Nikon D5300 User Manual page 182

A
Selecting Manual Focus with the Camera
If the lens supports M/A (autofocus with manual override) or A/M
(autofocus with manual override/AF priority), manual focus can also
be selected by setting the camera focus mode to MF (manual focus;
0 51). Focus can then be adjusted manually, regardless of the mode
selected with the lens.
A
Focal Plane Position
The position of the focal plane is indicated by the focal plane
mark on the camera body. The distance between the lens
mounting flange and the focal plane is 46.5 mm (1.83 in.).
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46.5 mm
Focal plane mark