Nikon SB-80DX - Manual (Page 14)

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In this manual, Nikkor lenses are divided into two types: CPU Nikkor lenses and
non-CPU Nikkor lenses.
Lenses
CPU Nikkor lenses
G-type Nikkor‚ D-type Nikkor‚ Non-G/D-type AF Nikkor
(except for AF Nikkor for the F3AF)‚ AI-P Nikkor
Non-CPU Nikkor lenses AI-S Nikkor, AI Nikkor‚ Series E
CPU lenses
CPU lenses have CPU contacts.
G-type Nikkor lenses
G-type Nikkor lenses send distance information to the
camera body, but do not have an aperture ring. Therefore,
set the aperture on the camera body. With some cameras,
the usable exposure mode is limited. For more details,
refer to the lens instruction manual.
D-type Nikkor lenses
D-type Nikkor lenses send distance information to the
camera body. Set the aperture either on the lens aperture
ring or on the camera body. For more details, refer to the
lens instruction manual.