Canon POWERSHOT PRO 1 User's Guide Page 176

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Using an Externally Mounted Flash (Sold Separately) (continued)
172
3
Turn the mode dial to a position other than or
.
Speedlite 220EX, 380EX, 420EX, 550EX, Macro Ring Lite
MR-14EX or Macro Twin Lite MT-24EX
z The flash will automatically adjust its output in the , , ,
, P, Tv and Av modes when [Flash Adjust] is set to [Auto]. The
maximum flash synchro shutter speed is 1/250 second.
z In M mode or when [Flash Adjust] is set to [Manual], the flash will
fire with manual adjustments. The maximum flash synchro shutter
speed in this case is 1/250 second. Set the aperture to an
appropriate value according to the flash’s guide number and the
distance to the subject. Check the camera’s ISO sensitivity setting
since the flash’s guide number will change with the ISO value.
z When [Flash Adjust] is set to [Manual], the flash output can be
adjusted. When [Flash Adjust] is set to [Auto] the flash exposure
compensation can be adjusted (p. 107).
z In M mode or when [Flash Adjust] is set to [Manual], the output of
an externally mounted flash can be adjusted in the flash output
adjustment screen (p. 108). When a Speedlite 550EX, a Macro
Ring Lite MR-14EX or a Macro Twin Lite MT-24EX is mounted on
the camera, you can adjust the flash output from either the flash or
the camera. (The flash setting overrides the camera setting when
both are set.) To set it from the flash, you are recommended to use
the flash’s manual mode. You can also adjust the flash output
even when the camera is set to the E-TTL automatic flash
exposure compensation mode by changing the flash exposure
compensation setting. In this situation, the +2 step setting fires the
flash at full intensity.
To shoot with the flash, you are recommended to set the white
balance to the (Flash) setting.
Other Canon Flashes
z Since other flashes fire at full strength, set the shutter speed and
aperture accordingly. Set the shutter speed to 1/125 second or
slower, and set the aperture to a value appropriate to the flash’s
guide number and the distance to the subject.
You are recommended to set the white balance to (Flash) to
shoot.
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