Canon SPEEDLITE EL-1 Advanced User's Manual page 109

Restrictions on Functions Depending on the Camera
Used
Depending on the camera, functions in radio transmission wireless strobe photography may
be limited.
EOS DIGITAL cameras released in and after 2012
When using the flash with EOS DIGITAL cameras released in and after 2012, you can
shoot without any restrictions on the flash mode and flash synchronization speed, etc.
* Although EOS REBEL T100/4000D/3000D, EOS REBEL T7/1500D/2000D,
EOS REBEL T6/1300D and EOS REBEL T5/1200D were released after 2012, restrictions on
functions are the same as with EOS DIGITAL cameras released up to 2011 (See the following
explanation for details).
EOS cameras compatible with E-TTL and released up to 2011
When using the flash with the cameras listed below, radio transmission wireless
shooting using E-TTL autoflash is not possible. Use manual flash (
transmission wireless strobe photography (
EOS-1Ds, EOS-1D, EOS-1V, EOS-3, EOS Elan II/Elan II E/50/50E,
EOS REBEL 2000/300, EOS REBEL G/500N,
EOS REBEL XS N/REBEL G II/3000N/66, EOS IX, EOS IX Lite/IX7
Also, when using the flash with an EOS DIGITAL camera or EOS film camera
released up to 2011, the following restrictions apply.
(1) The maximum flash synchronization shutter speed is one step slower.
Check the maximum flash sync shutter speed (X = 1/*** sec.) of your camera and shoot
with a shutter speed up to 1 stop slower than the maximum flash sync shutter speed
(Example: At X = 1/250 seconds, radio transmission wireless strobe photography is
possible within a range of 1/125 to 30 seconds.).
If you lower the shutter speed by one step from the maximum flash synchronization
shutter speed, the <
(2) High-speed sync shooting is not possible.
(3) Group firing (
(4) Modeling flash from the receiver (
are not possible.
(5) It cannot be used as a "receiver camera" during linked shooting (
be used as a "sender camera".
> warning icon will disappear.
) is not possible.
).
) and remote release from the receiver (
109
) or optical
)
). It can only