What Sony says
Black-and-white monotone. Saturation can't be adjusted on it.
In our words. The original is in the α7 IV Help Guide, where it is listed as BW(Black & White).
Which cameras have it
All 18 Help Guides we checked on 2026-10-11 list BW: α7 IV, α7C II, α7CR, α6700, α7R V, α7S III, α1, ZV-E1, ZV-E10 II, FX3, FX30, α7 V, α7R VI, α9 III, α1 II, FX2, RX1R III and RX10 V. The full list with links is on the settings page.
Settings
The eight settings can be adjusted on BW on their own, with the same ranges as every other look. Saturation is the exception: it can't be adjusted on a monochrome look. The eight settings explained.