Nikon Nikon Df Product Manual - Page 94

A Minimum Shutter Speed Auto shutter-speed selection can be fine-tuned by highlighting Auto and pressing 2: for example, values faster than those usually selected automatically can be used with telephoto lenses to reduce blur. Note, however, that Auto is available only with CPU lenses or when lens data are provided for non-CPU lenses; if a non-CPU lens is used without lens data, minimum shutter speed is fixed at 1/30 s. Shutter speeds may drop below the selected minimum if optimum exposure can not be achieved at the ISO sensitivity chosen for Maximum sensitivity. 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 242). When a flash is used, the value selected for Minimum shutter speed is ignored in favor of the option selected for Custom Setting e1 (Flash sync speed, 0 257). Note that ISO sensitivity may be raised automatically when auto ISO sensitivity control is used in combination with slow sync flash modes (available with optional flash units; 0 116), possibly preventing the camera from selecting slow shutter speeds. S 74