Canon SPEEDLITE EL-1, Advanced User'S Manual

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Difference between Radio Transmission and Optical
Transmission
Wireless shooting using radio transmission provides some advantages over wireless
shooting using optical transmission, such as less interference from obstacles and not having
to point the receiver's wireless sensor toward the sender unit. The main functional
differences are as follows.
Function Radio transmission Optical transmission
Transmission distance Approx. 30 m / 98.4 ft. Approx. 15 m / 49.2 ft. (indoors)
Firing group control
Up to 5 groups *
1
(A, B, C, D, E)
Up to 3 groups
(A, B, C)
Receiver control Up to 15 No restriction
Channel Auto, Ch. 1 - 15 Ch. 1 - 4
Wireless radio ID 0000 - 9999 –
Receiver controls
Test flash ○ –
Modeling flash ○ * 2 –
Release ○ *
3
–
* 1-3: Restrictions exist depending on the camera (*1: Restrictions on Functions Depending on the
Camera Used , Shooting in a Different Flash Mode for Each Group , *2: Test Flash / Modeling Flash
from a Receiver Unit , *3: Remote Release from a Receiver Unit ).
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