IMAX was originally defined by the use of its proprietary 15/70 IMAX film, which runs through the projector horizontally—unlike most other film stock. The usable image area of each frame is 69.6 mm × 48.5 mm—about 10 times that of a standard 35-mm frame and thrice as large as that of a 5-perf 70-mm frame. This larger image area allows for much more photographic information to be captured, which translates to a larger, sharper image with greater detail and low film grain.
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