Nikon F4 Instruction Manual page 10

High Speed Battery Pack MB-21
Grip portion (MB-21G)
Battery holder (MS-21)
Shutter release button lock lever
Bottom portion (MB-21B)
Shutter release button
Shutter lock index Remote terminal
Grip release lever
Tripod socket
Battery chamber
Mounting screw
LED indicators
Battery selector
Guide pin
Battery check button
Lock screw
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