The user selects maximum gain to cause {HEAD ~ a scene} to go dark at {TAIL ~ a certain low light level} rather than gaining up to a noisy image 
to go dark at
The user selects maximum gain to cause { HEAD ~ a scene } to go dark at { TAIL ~ a certain low light level } rather than gaining up to a noisy image
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH