Canon EOS REBEL T1 i/EOS 500D Instruction Manual page 197

Canon Speedlites other than the EX-series
With an EZ/E/EG/ML/TL-series Speedlite set in TTL or A-TTL
autoflash mode, the flash can be fired at full output only.
Set the camera's shooting mode to <M> (manual exposure) or
<
Av
> (aperture-priority AE) and adjust the aperture setting before
shooting.
W$
When using a Speedlite which has manual flash mode, shoot in the
manual flash mode.
Using Non-Canon Flash Units
Sync Speed
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.
Cautions for Live View shooti n9
A non-Canon flash will not fire during Live View shooting .
. . w,
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.
l$
Do not attach a high-voltage flash unit on the camera's hot shoe. It might
I
not fire.
197