I showed films for about 18-years on a Cinerama screen (Uptown in Washington, DC). There were zero issues with running drama movies in a 1.85 ratio on the deep curve, with respect to how they looked. Because you are in that middle part of the curve the geometric mismatch of the lens/screen was minimalized. Our 1.85 lenses used Magnacoms and fit our screen pretty well. For 70mm, we had curved field lenses (ISCO)...it was Scope that was the rough format.
The problem with just warping an image for the deep curve (electronically) is that while you can compensate, to a degree, for the geometry...you blow a lot of your resolution once you start morphing pixels and you are still projecting the original imager so focus, loss of light...etc. remain. Ideally, for a projector, you want to "fix" it optically so all of the pixels and light get to the screen. It would cost a small fortune to get custom ground lenses for a 1-off though.
The problem with just warping an image for the deep curve (electronically) is that while you can compensate, to a degree, for the geometry...you blow a lot of your resolution once you start morphing pixels and you are still projecting the original imager so focus, loss of light...etc. remain. Ideally, for a projector, you want to "fix" it optically so all of the pixels and light get to the screen. It would cost a small fortune to get custom ground lenses for a 1-off though.
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