Reference: More on Photography (All Modes)/ISO Sensitivity 37ISO SensitivityPhotographs taken at slow shutter speeds are prone to blurring. If ISO sensitivity is raisedabove the base setting of ISO 100 equivalent, the same exposures can be achieved at fastershutter speeds, preventing blur. ISO sensitivity can be set to values between ISO 100 andISO 1600 in steps of 1EV, with a further high sensitivity setting of HI 1 available for an ISOequivalent of roughly 3200. (auto) and Digital Vari-Program modes also offer an Autosetting that allows the camera to automatically raise sensitivity when lighting is poor orlower sensitivity when lighting is bright. Rotating the mode dial from P, S, A, or M to or aDigital Vari-Program mode automatically restores the default ISO sensitivity of Auto.Controls usedSensitivityISO sensitivity is the digital equivalent of film speed. The higher the ISO sensitivity, the less lightneeded to make an exposure, allowing higher shutter speeds or smaller apertures. Just as higherspeed films tend to be “grainy,” pictures taken at high ISO sensitivities are prone to mottling.ISO Sensitivity ( 73)ISO sensitivity can also be set using the ISO sensitivity option in the shooting menu.10—ISO Auto ( 76)This option can be used to enable automatic ISO sensitivity control in P, S, A, and M modes. When HI 1is selected, automatic ISO sensitivity control is disabled.11— /Fn Button ( 77)ISO sensitivity can also be set using the command dial.
