Nikon D780 DSLR Camera (Body Only) - Manual (Page 235)

189 Shooting Settings
A The Photo Shooting Menu [ISO Sensitivity Settings] Option
ISO sensitivity can also be adjusted using the
[
ISO sensitivity settings ] item in the photo
shooting menu.
A High ISO Sensitivities
The higher the ISO sensitivity, the less light
needed to make an exposure, allowing pictures
to be taken when lighting is poor and helping
prevent blur when the subject is in motion. Note, however, that the
higher the sensitivity, the more likely the image is to be affected by
“noise” in the form of randomly-spaced bright pixels, fog, or lines.
• “Noise” can be reduced by enabling high ISO noise reduction. High ISO
noise reduction can be enabled using the [
High ISO NR ] items in the
photo and movie shooting menus.
A Hi 0.3–Hi 2
A setting of [ Hi 0.3 ] corresponds to an ISO sensitivity approximately
0.3 EV higher than ISO 51200 (ISO 64000) and [ Hi 2.0 ] to an ISO sensitivity
approximately 2 EV higher (ISO 204800). Note that pictures taken at these
settings are particularly prone to “noise” in the form of randomly-spaced
bright pixels, fog, or lines.
A Lo 0.3–Lo 1
The settings [ Lo 0.3 ] through [ Lo 1.0 ] correspond to ISO sensitivities 0.3–
1 EV below ISO 100 (ISO 80–50 equivalent). Use for larger apertures or
slower shutter speeds when lighting is bright. Highlights may be
overexposed. In most cases, ISO sensitivities of ISO [
100 ] or above are
recommended.