The flash always fires at full output, Flash exposure compensation cannot be set, High-speed sync cannot be set in the av mode – Canon EOS-1D Mark IV User Manual
Page 252: Live view shooting is not possible, Aperture cannot be set
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Troubleshooting Guide
The flash always fires at full output.
• If you use a flash unit other than an EX-series Speedlite, the flash will
always be fired at full output (p.120).
• When the
[Flash metering mode]
flash Custom Function is set to
[TTL (autoflash)],
the flash will always be fired at full output (p.124).
Flash exposure compensation cannot be set.
• If flash exposure compensation has already been set with the Speedlite,
flash exposure compensation cannot be set with the camera. When the
Speedlite’s flash exposure compensation is canceled (set to 0), flash
exposure compensation can be set with the camera.
High-speed sync cannot be set in the Av mode.
• Set
[.1i>.C.Fn I -15: Flash sync, speed in Av mode]
to
[0: Auto]
(p.212).
Live View shooting is not possible.
• For Live View shooting, use a memory card (a hard disk-type card is
not recommended). A hard disk-type card requires a lower temperature
range for operation than memory cards. If the temperature gets too
high, the Live View shooting may stop temporarily to prevent damage
to the card’s hard disk. When the camera’s internal temperature
decreases, you can resume Live View shooting (p.139).
During Live View shooting, the iSO speed, shutter speed, and
aperture cannot be set.
• Set
[LV Ù/'W set]
to
[Stills]
(p.126).
The shutter makes two shooting sounds during Live View shooting.
• During Live View shooting, the shutter will make two sounds when you
take a picture (p.127).
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