Nikon 1 J5 Reference Manual page 48

Attach a lens.
4
Be careful to prevent dust from entering the camera when the
lens or body cap is removed. The lens generally used in this
manual for illustrative purposes is a 1 NIKKOR VR 10–30mm
f/3.5–5.6 PD-ZOOM.
s
Keeping the mounting marks
aligned, position the lens on
the camera
26
Remove the
rear lens cap
Remove the camera body cap
Mounting mark (camera)
Mounting mark (lens)