TO CONFIRM SHARPNESS BEFORE SHOOTING-DEPTH-OF-FIELD PREVIEW BUTTON

Note that when you'reusing a lens with an automatic

While the depth-of-field preview button is depressed, shutter

diaphragm, which is what most Nikkor lenses have, the

speed indication disappears and F- - appears in the LCD

viewfinder image you see is one with the lens fully open (i.e.,

aperture readouts; also, the shutter is locked.

lens at maximum aperture). This enables you to view the depth

 

of field before you take the picture, with the N90'sAperture-

 

Priority auto or Manual exposure mode.

 

Depress the depth-of-field preview button to stop the lens

 

down to the aperture set. The image viewed becomes

 

progressively darker as the aperture gets smaller. Portions of

 

the picture that appear in focus when the button is pushed

 

down are within the depth of field.

 

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Image 97
Nikon N90 instruction manual