Nikon D3100 2 manual ISO Sensitivity Settings, Auto ISO Sensitivity, 132, Adjust ISO sensitivity 0

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ISO Sensitivity Settings Gbutton ➜ Cshooting menu

Adjust ISO sensitivity (0 71).

❚❚Auto ISO Sensitivity

If Off is chosen for Auto ISO sensitivity in P, S, A, and M modes, ISO sensitivity will remain fixed at the value selected by the user (0 71). When On is chosen, ISO sensitivity will automatically be adjusted if optimal exposure can not be achieved at the value selected by the user (ISO sensitivity is adjusted appropriately when the flash is used). The maximum value for auto ISO

sensitivity can be selected using the Max. sensitivity option in the Auto ISO sensitivity menu (choose lower values to prevent noise (randomly-spaced bright pixels, fog, or lines); the minimum value for auto ISO sensitivity is automatically set to ISO 100). In modes P and A, sensitivity will only be adjusted if underexposure would result at the shutter speed selected for Min. shutter spd (1/2000–1 s; in modes S and M, sensitivity will be adjusted for optimal exposure at the shutter speed selected by the user). Slower shutter speeds will be used only if optimum exposure can not be achieved at the ISO sensitivity value selected for Max. sensitivity. If the ISO sensitivity selected by the user is higher than the value selected for Max. sensitivity, the value selected for Max. sensitivity will be used instead.

When On is selected, the viewfinder shows ISO-AUTOand the information display ISO-A. These indictors blink when sensitivity is altered from the value selected by the user.

AAuto ISO Sensitivity Control

Noise (randomly-spaced bright pixels, fog, or lines) is more likely at higher sensitivities. Use the Noise reduction option in the shooting menu to reduce noise (0 134). Note that ISO sensitivity may be raised automatically when auto ISO sensitivity control is used in combination with slow sync flash modes (available with the built-in flash and SB-900, SB-800, SB-600, and SB-400 flash units), possibly preventing the camera from selecting slow shutter speeds.

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