Nikon D7100 Product Manual - Page 110
Turning Auto ISO Sensitivity Control On or Off, Auto ISO Sensitivity Control, High ISO NR
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When On is selected, the viewfinder and control panel show ISO-AUTO. When sensitivity is altered from the value selected by the user, these indicators flash. Control panel Viewfinder A Turning Auto ISO Sensitivity Control On or Off S You can turn auto ISO sensitivity control on or off by pressing the W (S) button and rotating the subcommand dial. ISO-AUTO is displayed when auto ISO sensitivity control is on. W (S) button Sub-command dial A Auto ISO Sensitivity Control Noise (randomly-spaced bright pixels, fog, or lines) is more likely at higher sensitivities. Use the High ISO NR option in the shooting menu to reduce noise (see page 228). If the shutter speed selected for Minimum shutter speed is slower than sync speed selected for Custom Setting e1 (Flash sync speed, 0 244), the sync speed will be used as the minimum shutter speed for auto ISO sensitivity control during flash photography. 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 304), possibly preventing the camera from selecting slow shutter speeds. When auto ISO sensitivity control is in effect, the adjusted and selected values appear in the information display as shown at right. Selected value Adjusted value 82