Canon EOS 5DS Instruction Manual page 166

A Selecting a Picture StyleN
U Faithful
Suited for processing the image with a computer. The color of a
subject that is captured in sunlight at a color temperature of 5200K
will be adjusted to match the subject's colorimetrical color. For
subdued images with modest brightness and color saturation.
V Monochrome
Creates black-and-white images.
Black-and-white images shot in JPEG cannot be turned into color. If you
want to later shoot pictures in color, make sure the [Monochrome] setting is
canceled.
You can display <z> in the viewfinder when [Monochrome] is set (p.409).
W User Def. 1-3
You can register a basic style such as [Portrait], [Landscape], a
Picture Style file, etc., and adjust it as desired (p.172). Any User
Defined Picture Style that is not set will have the same settings as
the [Standard] Picture Style.
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