Canon EOS 80D - Manual (Page 234)

D Using an External Speedlite
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 With an EZ/E/EG/ML/TL-series Speedlite set to A-TTL or TTL
autoflash mode, the flash can be fired at full output only.
Set the camera’s shooting mode to <a> (manual exposure) or
<f> (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 non-Canon compact flash units at
1/250 sec. and slower speeds. With large studio flash units, be sure to
test the flash synchronization before shooting with the sync speed set
within approx. 1/60 sec. to 1/30 sec. The flash duration of such units is
longer than that of compact flash units and varies depending on the
model.
Cautions for Live View Shooting
If you use a non-Canon flash unit with Live View shooting, set [z6:
Silent LV shoot.] to [Disable] (p.272). The flash will not fire if it is set to
[Mode 1] or [Mode 2].
Canon Speedlites Other Than the EX-series
Non-Canon Flash Units
 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.