Taking Photographs—ExposureExposure76CPU Lenses (All Exposure Modes)If you are using a CPU lens equipped with an aperture ring, the aperture ring must beset to the minimum aperture (highest f/-number). At other settings, the shutter releasewill be disabled and a blinking will appear in the aperture displays in the controlpanel and viewfinder. Type G lenses are not equipped with an aperture ring.Depth-of-Field Preview (All Exposure Modes)To get an idea of how your photograph will look at thecurrent aperture setting, press and hold the depth-of-field preview button. The lens will be stopped down tothe aperture value selected by the camera in auto multiprogram or shutter-priority auto, or the value chosen by the user in aperture-priorityauto or manual exposure mode, allowing you to preview depth of field in the viewfinder.3—ISO Auto ( 148)When ON is selected for Custom Setting 3 (ISO Auto), the camera automatically variessensitivity in the range 200–1600 (ISO equivalent) to help ensure optimum exposurewhen the limits of the camera exposure metering system are exceeded at the sensitivityselected by the user. In programmed auto, this helps ensure that the correct exposurecan be achieved with subjects that would otherwise be too bright or too dark. In otherexposure modes, it helps ensure correct exposure at the shutter speed and/or apertureselected by the user. When sensitivity is altered from the value selected by the user, theviewfinder exposure-mode indicator (P, S, A, or M) will flash and the sensitivity indica-tor in the viewfinder (ISO) will be displayed in red. In the camera photo informationdisplay for pictures taken at altered sensitivities, the ISO value will also be displayed inred. Note that noise is more likely to appear in photographs taken at higher sensitivi-ties.ON can not be selected for ISO Auto when sensitivity is set to or ; similarly,or can not be selected when ISO Auto is on. If a flash is used when ISOAuto is on, ISO will be fixed at the value selected by the user.Exposure ModeYour choice of exposure mode determines how the camera sets shutter speedand aperture when adjusting exposure. Four modes are available: auto multiprogram (P), shutter-priority auto (S), aperture-priority auto (A), and manual(M).
