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 time.
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.