Nikon D7100 - Manual (Page 55)

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Attach the lens.
If the lens is equipped with an A-M or M/A-M mode
switch, select A (autofocus) or M/A (autofocus with
manual override).
A Detaching the Lens
Be sure the camera is off when removing or exchanging lenses. To
remove the lens, press and hold the lens release button (q) while
turning the lens clockwise (w). After removing the lens, replace the
lens caps and camera body cap.
D CPU Lenses with Aperture Rings
In the case of CPU lenses equipped with an aperture ring (0 296),
lock aperture at the minimum setting (highest f-number).
Mounting mark
(camera)
Mounting mark (lens)
Keeping marks (indicated by white dot) aligned, position
lens on camera, then rotate until lens clicks into place.