Nikon Camera N90 - Manual (Page 83)

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For users of lenses that have no CPU, or
accessories such as bellows attachment or
extension rings
Use Aperture-Priority Auto or Manual exposure mode.
Auto Multi-Program or Shutter-Priority Auto exposure
mode automatically shifts to Aperture-Priority Auto
exposure mode with F - - and blinking exposure mode
indicator. (If Matrix Metering is set on the camera,
metering system is also automatically shifted to Center-
Weighted and IHI blinks). Vari-Program cannot be used for
these lenses or accessories.