Nikon D3200 User Manual - Page 145

ISO Sensitivity Settings Adjust ISO sensitivity (0 51). G button ➜ C shooting menu ❚❚ Auto ISO Sensitivity control If Off is chosen for Auto ISO sensitivity control in P, S, A, and M modes, ISO sensitivity will remain fixed at the value selected by the user (0 51). 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 Maximum sensitivity option in the Auto ISO sensitivity control 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 Minimum shutter speed (1/2000-1 s, or Auto; in modes S and M, sensitivity will be adjusted for optimal exposure at the shutter speed selected by the user). If Auto (available only with CPU lenses) is selected, the camera will choose the minimum shutter speed based on the focal length of the lens. Slower shutter speeds will be used only if optimum exposure can not be achieved at the ISO sensitivity value selected for Maximum sensitivity. When On is selected, the viewfinder shows ISO-AUTO and the information display ISO-A. These indictors flash when sensitivity is altered from the value selected by the user. i A Auto 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 (0 131). 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 the optional flash units listed on page 173), possibly preventing the camera from selecting slow shutter speeds. 129