Using Non-Canon Flash Units; Lcd Panel Illumination - Canon EOS 350D Instruction Manual

Using EOS-Dedicated, External Speedlites
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Before attaching an external Speedlite, retract the built-in flash if it is
popped up.
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If the EX-series Speedlite's firing mode is set to TTL autoflash with the
Custom Function, the Speedlite will not fire.
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If autofocus cannot be achieved, the external, EOS-dedicated
Speedlite's AF-assist beam (if the Speedlite has an AF-assist beam) will
be emitted automatically (except in the <3> <5> <7> modes).
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The camera is a Type-A camera that can use all the features of EX-
series Speedlites.

Using Non-Canon Flash Units

The camera can synchronize with compact, non-Canon flash units at 1/
200 sec. or slower. Be sure to test the flash unit beforehand to make
sure it synchronizes properly with the camera.
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If the camera is used with a flash unit or flash accessory dedicated to another
camera brand, the camera may not operate properly and malfunction may result.
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Do not attach a high-voltage flash unit on the camera's hot shoe. It might not work.
U LCD Panel Illumination
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Pressing any shooting-related button or turning the Mode Dial while the
LCD panel is illuminated prolongs the illumination.
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When the camera is connected to a printer and the <U> button turns
blue, the button functions as a Direct print button. (p.136)
102
The LCD panel is provided with
illumination.
To illuminate the LCD panel, press the
<U> button (9). To turn off the
illumination, press the button again. Use
it to read the LCD panel in the dark.