Nikon N90 AF Instruction Manual page 56

OPERATION IN SHUTTER-PRIORITY AUTO EXPOSURE MODE
1. Set lens to its minimum aperture setting (highest f-number).
With AF Nikkor and AI-P Nikkor lenses, lock lens aperture at
minimum setting (refer to lens instruction manual).
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FS.S
2. While pressing MODE button, rotate command dial until "5 "
appears on LCD panel and viewfinder.
If "bulb" is set on the camera, selecting the Shutter-
Priority (S) Auto exposure mode will cause
bul b
to
blink-a warning that the "bulb" setting cannot be used in
in the S mode.
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