Originally posted by Jim Cassedy
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Single strip 70mm Cinerama and D-150 had special projection lenses that compensated for the deep curve. D-150 actually worked better than 70mm CInerama did, because it also pre-distorted the projected image to make it fit better on a deep curve, where Cinerama's lens was strictly a deep focus spherical lens that did nothing to compensate the image to fit it to a deep curve. The D-150 Curvalon lens was technologically ahead of the spherical 70mm Cinerama lens. BTW: Each of the lenses are massive and weigh about 20+ pounds depending on it's focal length and or back up lens in the case of D-150...
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