QUESTION:
Does the Pathfinder Lander's imager perform well under low light conditions?
Would it have the ability to image the Martian skies when the Sun has set,
perhaps to take a long distance snapshot of Earth low in its horizon?

ANSWER from David Dubov:
The camera can expose for up to 32 seconds, which gives it a respectable
low-light capability. Peter Smith reports that the University of Arizona
have recently imaged Orion (the constellation, not the nebula) and gotten
good results. We expect to image bright stars and planets during the mission
and can probably image Earth as well. Please note however, Earth is less
than a pixel wide in the IMP.