Nikon Z8 User Manual page 511

RAW Recording
Choose a compression type for NEF (RAW) photographs. In descending order by the size of the files
produced, the options are: [Lossless compression], [High efficiencym], and [High efficiency].
[High efficiencym] produces pictures that compare favorably in quality to those produced by
[Lossless compression] and are higher in quality than those produced by [High efficiency].
G button U C photo shooting menu
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RAW Recording