Nikon NIKKOR Z 70-200mm f/2.8 VR S Lens - Manual (Page 103)

79 Shooting Controls
D
Lo 0.3–Lo 1
Lo 0.3 through Lo 1 correspond to ISO sensitivities 0.3–1 EV below the
lowest numerical value. Lo 0.3 is equivalent to ISO 50 (Z 7) or 80 (Z 6),
Lo 1 to ISO 32 (Z 7) or 50 (Z 6). Use for larger apertures or slow shutter
speeds when lighting is bright. Highlights may lose some detail; in
most cases, ISO sensitivities at or above the lowest numerical value are
recommended.