Canon EOS 40D - Manual (Page 105)

105
Basically operates like a built-in flash for easy operation.
When an EX-series Speedlite is attached to the camera, almost all the
autoflash control is done by the camera. In other words, it is like a high-
output flash attached externally in place of the built-in flash. For detailed
instructions, see the EX-series Speedlite’s instruction manual. This
camera is a Type-A camera that can use all the features of EX-series
Speedlites.
With an EZ/E/EG/ML/TL-series Speedlite set in the TTL or A-TTL
autoflash mode, the flash can be fired at full output only. Set the
camera’s shooting mode to manual or aperture-priority AE and
shoot.
When using a Speedlite which has manual flash mode, shoot with
the manual flash mode.
With an EX-series Speedlite set to TTL autoflash with the flash’s
Custom Function, the flash will fire at full output only.
External Speedlites
EOS-dedicated, EX-series Speedlites
Canon Speedlites other than the EX-series
Shoe-mount Speedlites Macro Lites