When I first moved to Maine, there was a cinema in Waterville (now a fundementalist church!) that had two very large screens, both of them with shallow curves (probably about 130 degrees). Every movie was shown on them. As I am sure the prints were not recitified, they must have projected non-distorted images using a spherical lenses designed especially for that set-up. I loved that theater, and attended it every week almost without fail. In the 70's, both auditoriums were divided in half to make 4 theaters, all with small, flat screens. It was criminal, in my opinion.