The camera’s sensitivity to light can be adjusted according to the amount of light available. Choose from settings that range from ISO 64 and ISO 25600 in steps equivalent to 1/3 EV. Settings of from about 0.3 to 1 EV below ISO 64 and 0.3 to 2 EV above ISO 25600 are also available for special situations. The higher the ISO sensitivity, the less light needed to make an exposure, allowing higher shutter speeds or smaller apertures.
ISO sensitivity can be adjusted by pressing the S (Q) button and rotating the main command dial until the desired setting is displayed in the control panel and viewfinder.
The ISO Sensitivity Menu
ISO sensitivity can also be adjusted using the ISO sensitivity settings option in the photo shooting menu (0 ISO Sensitivity Settings).
The higher the ISO sensitivity, the less light needed to make an exposure, allowing faster shutter speeds or smaller apertures, but the more likely the image is to be affected by noise (randomly-spaced bright pixels, fog, or lines). Noise is particularly likely at settings between Hi 0.3 and Hi 2.
Hi 0.3–Hi 2
The settings Hi 0.3 through Hi 2 correspond to ISO sensitivities 0.3–2 EV over ISO 25600 (ISO 32000–102400 equivalent).
Lo 0.3–Lo 1
The settings Lo 0.3 through Lo 1 correspond to ISO sensitivities 0.3–1 EV below ISO 64 (ISO 50–32 equivalent). Use for larger apertures when lighting is bright. Contrast is slightly higher than normal; in most cases, ISO sensitivities of ISO 64 or above are recommended.
For information on:
- Choosing the ISO sensitivity step size, see A > Custom Setting b1 (ISO sensitivity step value; 0 ISO Sensitivity Step Value).
- Displaying ISO sensitivity in the control panel, see A > Custom Setting d3 (ISO display; 0 ISO Display).
- Reducing noise in photos taken at high ISO sensitivities, see C > High ISO NR (0 High ISO NR).
- Reducing noise in movies shot at high ISO sensitivities, see 1 > High ISO NR (0 High ISO NR).