Pentax ist - Manual (Page 84)

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SELECTING ANOTHER EXPOSURE MODE
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MEMO
• The AE lock does not operate in the Metered Manual Mode.
• When using negative color film, the finished print is not greatly affected
by a certain amount of over- or under-exposure. This is because color
negative film has wide latitude. If you use positive (slide) film, which
has narrow latitude, you need to adjust the aperture and shutter speed
to intentionally over- or under-expose the shot.
Exposure Warning
If the subject is too bright or too dark,
both shutter speed and aperture
setting will blink in the viewfinder and
on the LCD panel. It means that the
exposure is out of metering range,
unable to obtain a correct exposure
even if the shutter speed and aperture
are adjusted. Use an ND (Neutral Density) filter or select a
darker subject if the subject is too bright. Use a flash if it is too
dark.