Appendix #7   Projector Aspect Ratio
The Projector Aspect Ratio ("F", "S" or "C") indicates the pixel array size at which the projector should be set.  It does not necessarily indicate the aspect ratio of the image -- or theatre masking instructions -- since often times content such as trailers may be letterboxed or pillarboxed.  The choices are:
F = Flat (1.85:1)  Pixel array size:   1998 x 1080 = 2k     3996 x 2160 = 4k   S = Scope (2.39:1)  Pixel array size:   2048 x 858 = 2k     4096 x 1716 = 4k   C = Full Container (1.90:1)  Pixel array size:   2048 x 1080 = 2k     4096 x 2160 = 4k
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