Canon CDI-E151-010 Cause, Problem, Solution, ISO 100 equivalent:

Problem	Cause			Solution
Image is blurred or out	Camera moved.	zBe careful not to move the camera when pressing the shutter
of focus		button.
		zUse a tripod at slow shutter speeds when the camera shake
		warning	appears.
	Autofocus function hampered by obstruction to	Be careful not to block the AF auxiliary light emitter with your
	AF auxiliary light emitter.	finger or other items.
	AF-assist Beam is set to off.	Set the AF-assist Beam to [On].
		 See Rec. Menu (p. 67)
	Subject out of focal range.	zEnsure that there is at least 44 cm (1.4 ft.) between the
		camera lens and subject.
		zUse the	(Macro) mode to shoot close-ups between 4 and
		44 cm (1.6 in. and 1.4 ft.) at maximum wide angle and 30 and
		44 cm (1.0 ft. and 1.4 ft.) at maximum telephoto.
	Subject is hard to focus on.	Use the focus lock or the manual focus to shoot the image.
		 See Shooting Problem Subjects for the Autofocus (p. 96).
Subject in recorded	Insufficient light for shooting.	Set the flash to on.
image is too dark	Subject dark in comparison to the background.	zSet the exposure compensation to a positive (+) setting.
		zUse the AE lock or spot metering function.
		 See Locking the Exposure Setting (AE Lock) (p. 89)
		and Switching between Light Metering Modes (p. 78).
Subject in recorded	Subject too far for flash to reach.	zTo use the flash, shoot within the following ranges:
image is too dark		ISO 100 equivalent: 55 cm to 4.2 m (1.8 ft. to 14 ft.) from the
		subject at the maximum wide angle and within 55 cm to 2.0 m
		(1.8 ft. to 6.6 ft.) at the maximum telephoto setting.
		zRaise the ISO sensitivity and then shoot.
		 See Changing the ISO Speed (p. 84).
				Appendix 141