Canon MT-26EX-RT Macro Twin Lite - Manual (Page 109)

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MT-26EX-RT System
% Speedlite equipped with radio transmission wireless slave
function
600EX II-RT, 600EX-RT, 430EX III-RT
& Speedlite equipped with optical transmission wireless slave
function
600EX II-RT, 600EX-RT, 600EX, 580EX II, 580EX, 550EX,
430EX III-RT/430EX III, 430EX II, 430EX, 420EX, 320EX, 270EX II
' Compact Battery Pack CP-E4N
A small and lightweight external power source with superior
portability.
When using a Speedlite without a function for switching the firing groups
(A, B, C) in
& , you can use the Speedlite as a slave in firing group A
during optical transmission wireless multiple flash shooting (you cannot
use it as a slave in firing group B or C).
Using an external power source other than Canon may result in a
malfunction.
For external power source, use of the Compact Battery Pack CP-E4N (sold
separately) is recommended.