Canon REBEL SL1 EOS 100D Instruction Manual page 17

External Speedlites
With an EZIEIEGIMLITL-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 <i> (manual exposure) or
<AM> (aperture-priority AE) and adjust the aperture setting before
shooting.
When using a Speedlite that has manual flash mode, shoot in the
manual flash mode.
Sync Speed
The camera can synchronize with compact, non-Canon flash units at
1/200 sec. or slower shutter speeds.
Use a sync speed slower than 1/200 sec.
Be sure to test the flash unit beforehand to make sure it synchronizes
properly with the camera.
Cautions for Live View Shooting
A non-Canon flash will not fire during Live View shooting.
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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.
, Do not attach a high-voltage flash unit on the camera's hot shoe. It may
not fire.
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