>>wow, skip fodder
Yes, they were free.
D/N could be Day/Night. Easy enough to check. turn the lights off and see if the image goes to black and white.
BLC works like HDR. pictures here: https://www.cctvcameraworld.com/blc-hlc-wdr-in-camera-image-sensors/
BS - Black Stretch ??? Another Panasonic prop feature. - designed to make shadows and dark areas appear clearer in the camera view...
ALC - ALC adjustment would control iris compensation for bright spots within the field of view...
ELC - ELC compensates for moderate light changes in indoor applications without the use of expensive auto iris lenses.
Presumably, ALC is best for outdoor scenes (wider light level variations), while ELC is better for indoors?