Nikon D300 User Manual page 136

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Frame a photograph, focus, and shoot.
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Non-CPU Lenses
If the maximum aperture of the lens has been
specified using the [Non-CPU lens data] item in
setup menu (pg. 199) when a non-CPU lens is
attached, the current f-number will be displayed
in the viewfinder and control panel, rounded to
r'iiiil
the nearest full stop. Otherwise the aperture - _
displays will show only the number of stops (JF,
with maximum aperture displayed as
JFO)
and the f-number must be read
from the lens aperture ring.
110