If the gain control reaches maximum without ill-effects on the
direct screen and further gain is required, then select AVERAGE mode
on the Grinnell and adjust the number of frames of integration ONE
step at a time waiting between steps to see the resultant image.
When the Grinnell is in the AVERAGE mode, the direct monitor will
flash the integrated signal with a period equal to the integration
Finally, at the risk of being boring, be EXTREMELY CAREFUL ON BRIGHT
STARS - if an object looks too bright in the monitor then it IS too
bright so turn down the gain p.d.q.