FujiFilm GFX 100II Owner's Manual page 422

Lenses
The camera can be used with lenses for the FUJIFILM
G-mount.
Lens Parts
A
Lens hood
B
Mounting marks
C
Focus ring
D
Aperture ring lock release
E
Mounting marks (focal length)
N
A GF63mmF2.8 R WR lens is used here for illustrative purposes.
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F
Aperture ring
G
Lens signal contacts
H
Front lens cap
I
Rear lens cap