We recommend using either shutter priority "Tv" or aperture priority "Av" modes to take full advantage of Canon TTL flash exposure.

There is no TTL flash even with Canon's own flash in the camera "M" mode. Manual power settings can be selected with the multi-control button on the back of the camera. The strobe should still be left in TTL to take advantage of this feature.

In Aperture Priority mode "Av" the shutter speed should automatically go to 1/60 second.

If you want to shoot in TTL flash mode when using the camera's Av mode, make sure that "Auto" flash control is selected in the camera menu. It is possible to set the flash control to manual when using the Av mode.

Second curtain sync can be used.

When multiple exposure (continuous shooting) mode is used, the external flash will not fire. This is normal and also happens with Canon external speedlights.

Use of an optional #4100.6 EV Manual Controller precludes use of the TTL conversion circuitry.