as close as 18 inches or less. With lenses of short focal length it is possible to get greater perspective, that is objects in the foreground appearing large and those in the background appearing small. This is even more apparent with the Cinerama camera because of the three lens system and the extremely wide angle of view.
Horizontal lines above and below the optical axis of the lenses have a tendency to curve slightly and also show a definite break in continuity at the match-lines which gives an unreal effect on the angularity. Even a straight horizontal line on a level with the lenses' axii which record faithfully on the film will appear curved on the screen to some observers because of the curved screen used with the system. For the least disturbing effects, therefore, it is of advantage to avoid shooting subjects which possess or form a pattern of straight lines.
When the Cinerama camera is tilted up or down, vertical lines converge, as would be expected, but with the Cinerama camera the convergence is much more noticeable and each field (each for a separate lens) might appear to converge a slightly different apex. Because of the characteristic of the Cinerama camera, discretion should be exercised in tilting the camera upwards or downwards except under closely controlled conditions