The film features very interesting lighting effects, such as the strobe lights during the hypnosis scenes, or even some beautiful reflections on glasses and mirrors (some of then achieved in camera, others via optical effects & matte shots):
But the most impressive stuff are the surrealistic desert scenes, shot inside a soundstage. Fraker has said that he needed almost every arc in Hollywood and very deep f/stops to simulate such a high light intensity:
They also had to replicate the house, the exorcism and the street from the first film. I believe that there are some front projection shots in this scenes:
The film has also some impressive shots, like those with Reagan (Linda Blair) on the roof:
Perhaps it was Boorman who encouraged Fraker to lit the film in a more naturalistic way, with very little fill light (if so), against his usual high-key, low-con trademark style. Take a look at this shot, it could have been done by David Watkin himself.
And it's not the only one!
The DVD shows some poor blacks. I don't know if this was caused by some nets or other kind of difussion or even flashing, but that's something that I've seen before in other films shot by Fraker. It think that The Exorcist II is his best work, together with 1941. Sadly, the film is so so, which makes it barely known.
A final surprise!: