Nikon D70s Manual

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Contents

Nikon D70s Manual Manual pdf 86 page image

76Taking Photographs—ExposureExposure ModeWhen the mode dial is rotated to P, S, A, or M, the user can set shutter speedand aperture as described on the following pages.CPU LensesWhen using a CPU lens equipped with an aperture ring, lock the aperture ring at themin i mum aperture (highest f/-number). At other settings, the shutter release will bedis abled and a blinking will appear in the aperture displays in the top controlpanel and viewfinder. Type G lenses are not equipped with an aperture ring.Non-CPU LensesNon-CPU lenses can only be used in mode M, when aperture can be adjusted manuallyusing the lens aperture ring. In other modes, the shutter-release will be disabled and ablinking will appear in the control panel and viewfinder aperture displays.Depth-of-Field PreviewTo preview the effects of aperture, press and hold thedepth-of-field preview button. If a CPU lens is attached,the lens will be stopped down to the aperture valuese lected by the camera (P and S modes) or the valuecho sen by the user (A and M modes), al low ing depth offi eld to be previewed in the viewfinder (depth-of-fieldpreview is not available with non-CPU lenses).5—ISO Auto ( 142)When On is selected for Custom Setting 5 (ISO auto), the camera automatically variessensitivity in the range 200–1600 (ISO equivalent) to help ensure optimum expo sureand fl ash level. In P and A modes, the camera adjusts sensitivity when the shutterspeed needed to obtain optimum exposure would be faster than 1/8000 s or slower thana specifi ed value (shutter speed may drop below the specified value if optimal exposurecan not be achieved at ISO 1600 equivalent). Otherwise the camera adjusts sensitiv-ity when the limits of the camera exposure metering system are exceeded (mode S)or when optimum exposure can not be achieved at the shutter-speed and apertureselected by the user (mode M).When sen si tiv i ty is altered from the value se lect ed bythe user, ISO AUTO flashes in the control panel andviewfinder. In the camera photo information display forpictures taken at altered sensitivities, the ISO value willbe displayed in red. Note that noise is more likely to ap-pear in pho to graphs taken at higher sensi tiv i ties.