Here are Some XF400/XF405 Specifications [CR3]
LDS said:AFAIK DCI 4K is the 4K movie standard (see http://dcimovies.com/specification/DCI_DCSS_v12_with_errata_2012-1010.pdf, 4.3) which is "true" 4096x2160. Anamorphic is a different kind of recording/playing which needs special lenses.
4096x2160 is the sensor resolution used.
The footage can then get cropped to 3840x2160 for UHD (and scaled-down to 1920x1080 for regular HD).
Alternatively, the full 4096 can be used, and the horizontal res can be cropped for 1.85 (standard cinema) or various "flat" widescreen aspect ratios (2:1, 2.4:1).
Anamorphic generally uses the full 2160 height, and some fraction of the width, which depends on the anamorphic ratio of the lenses and the desired output format.
In other words, while cinema-style cameras shoot in 4K DCI (4096x2160), the resulting footage rarely gets shown in 4K DCI outside of an edit suite.
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