Nikon D3100 D3100 User's Manual - Page 87
ISO Sensitivity
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ISO Sensitivity "ISO sensitivity" is the digital equivalent of film speed. Choose from settings that range from a value roughly equivalent to ISO 100 to one roughly equivalent to ISO 3200 in steps equivalent to 1 EV. For special situations, ISO sensitivity can be raised above ISO 3200 by about 1 EV (Hi 1, equivalent to ISO 6400) or 2 EV (Hi 2, equivalent to ISO 12800). Auto and scene modes also offer an AUTO option, which allows the camera to set ISO sensitivity automatically in response to lighting conditions; AUTO is selected automatically in i and j modes. The higher the ISO sensitivity, the less light needed to make an exposure, allowing higher shutter speeds or smaller apertures. 1 Place the cursor in the information display. If shooting information is not displayed in the monitor, press the P button. Press the P button again to place the cursor in the information display. Information display P button z 2 Display ISO sensitivity options. Highlight the current ISO sensitivity in the information display and press J. 3 Choose an ISO sensitivity. Highlight an option and press J. To return to shooting mode, press the shutter-release button halfway. 71