Canon 850 IS - Manual (Page 113)

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Subject in recorded image is too dark.
Insufficient light for
shooting. Set the flash to (flash on) (Basic
Guide p. 14).
The subject is
underexposed because
the surroundings are too
bright. Set the exposure compensation to a
positive (+) setting
(p. 52) .
Use AE lock or use the spot metering
function
(pp. 49 , 51) .
Subject is too far away
for flash to reach. Shoot within correct shooting
distance of the subject when using
the built-in flash
(p. 130) .
Raise the ISO speed and then shoot
(p. 65) .
Subject in recorded image is too bright, or
image flashes white.
Subject is too close,
making the flash too
strong. Shoot within correct shooting
distance of the subject when using
the built-in flash
(p. 130) .
The subject is
overexposed because
the surroundings are too
dark. Set the exposure compensation to a
negative (-) setting
(p. 52) .
Use AE lock or use the spot metering
function
(pp. 49 , 51) .
Too much light is shining
directly into the camera,
or is being reflected off
the subject. Change the shooting angle.
Flash is set to on. Set the flash to (flash off) (Basic
Guide p. 14).
Image contains noise.
ISO speed is too high. Higher ISO speeds and the (High
ISO Auto) setting may increase
image noise. For higher image
quality, select as low an ISO speed
as possible
(p. 65) .
In , , , , , and
modes, the ISO speed increases and
noise can appear.