''Comin' at Ya'' was filmed in the over-and-under, single-strip 35 mm 3-D format. Two
Techniscope-format frames, one for the left-eye image and one for the right-eye image, are stacked one above the other in the same area as one ordinary 'Scope-format frame. The resulting frames, though diminished in size, yielded a nominal aspect ratio of 2.39:1. The lens system used was Optimax III (Bill Bukowski of Optimax III served as 3D Technical Advisor), notorious for introducing
vertical parallax error owing to its flawed design (i.e., the optical axes of its twin lenses are not at the same horizontal level). The film's posters by turns heralded the 3-D process as
SuperVision and
WonderVision. Projection required prismatic or "mirror box" converters in front of an ordinary spherical projection lens. These converters were meant to converge the stacked left and right pictures on the screen, at the same time cross-polarizing them to match the filters in the 3-D glasses worn by the audience. Gene Quintano was a producer. He says he appeared in the film "mostly as a matter of economics. Tony is the star and he's very good but this is not an actor's film. I mean, Robert Redford is not going to be sweating it out. The real star is supposed to be the 3-D." ==Filmways==