Compatible flash units
551
Supported features
A
Non-TTL auto
-
GN
Distance-priority manual
-
M
Manual
4
2
RPT
Repeating flash
-
Optical Advanced Wireless Lighting
Master
Remote flash control
4
2
i-TTL
i-TTL
4
2
[A : B]
Quick wireless flash control
-
q
A
Auto aperture
-
A
Non-TTL auto
-
M
Manual
4
2
RPT
Repeating flash
-
Remote
i-TTL
i-TTL
4
[A : B]
Quick wireless flash control
4
q
A/A
Auto aperture/non-TTL auto
-
M
Manual
4
RPT
Repeating flash
4
Radio-controlled Advanced Wireless Lighting
-
Color Information Communication (flash)
4
Color Information Communication (LED light)
4