Nikon D300 Complete Manual page 280

3. Use the Direction pad to navigate to the ISO
sensitivity settings option and press the > key on the
Direction pad to select it.
4. Use the Direction pad to navigate to the ISO
sensitivity option and press the > key on the
Direction pad to select it.
5. Use the Direction pad to select an ISO value and press
the > key on the Direction pad to select it.
Thom Hogan's Complete Guide to the Nikon D300
V1.02
Page 280