Pentax P5 Manual page 41

• All these warnings are displayed by the flickering of LEDs in
the viewfinder.
• "Beyond the metering range" means the subject is too bright or
too dark to be measured with the camera's built-in meter.
• "Beyond the coupling range" means the combination of shutter
speed and aperture is beyond the limit of use even when the
subject's brightness is within the metered range.
• For details on the metering/coupling ranges, refer to page 56.
• The symbol in the table indicates flickering. When the
warning indicates beyond-the-metering-range/beyond-the-coupling-
range, the shutter speed flickers as fast as four times per second.
When the brightness of the subject is beyond the metering range,
take pictures in the following ways:
• When the subject is too bright, use an ND filter locally available.
• When the subject is too dark, it is necessary to use a flash or some
other lightings.