Yongnuo YN-E3-RT II Review

Yongnuo YN-E3-RT II Radio Transmitter Review

Yongnuo YN-E3-RT II radio transmitter showing LCD display and controls
Yongnuo YN-E3-RT II Speedlite Transmitter


This updated version was released in December 2018 and replaces the older Yongnuo YN-E3-RT model. Make sure you buy the mark II version as the older version started to have compatibility issues with some of the newer Canon EOS cameras.

The Yongnuo YN-E3-RT II is a compact radio transmitter which sits on the camera’s hotshoe and can control speedlites such as the Yongnuo YN600EX-RT II or the Yongnuo YN968EX-RT. The YN-E3-RT II uses the Canon RT radio system and is therefore compatible with the newer range of Canon’s radio-enabled speedlites such as the Canon 600EX II-RT, 600EX-RT and the 430EX iii-RT.

Using a dedicated radio transmitter on your camera has the advantage of being much smaller and lighter than using a master speedlite to control slave flashes and it’s also cheaper. The YN-E3-RT II has a range of up to 100m, supports E-TTL II and high speed sync. It can control up to 5 groups and up to 15 speedlites and has an infra-red autofocus assist lamp.

As many people will realise, the Yongnuo YN-E3-RT II is almost an exact copy of the Canon ST-E3-RT transmitter.

Related Posts:
Yongnuo YN-E3-RT II vs YN-E3-RT
Yongnuo YN-E3-RT II vs Canon ST-E3-RT

Guide Price £103 / US$95

Amazon (UK) / B&H Photo (US) / Adorama (US) / Amazon (US)


The Yongnuo YN-E3-RT II Speedlite Transmitter is compatible with the Yongnuo YN600EX-RT II, YN968EX-RT, the Canon 600EX ii-RT, 600EX -RT and the Canon 430EX III-RT (basically any Canon Speedlite with an “RT” in the name).

Manual Exposure

Manual / output settings: Yes – 1/1- 1/128
Manual steps: 1/3 stop increments

ETTL Exposure

Canon E-TTL/ E-TTL II with flash exposure compensation (FEC), flash exposure lock (FE lock) and flash exposure bracketing (FEB) 

Wireless Communication

Radio Wireless (RF) 2.4GHz
Uses the Canon RT 2.4GHz radio system
Transmitter maximum range approximately: up to 100m
No. of groups: 5 (A, B, C, D & E) up to 15 units
No. of channels: Auto, 15 channels and 10,000 wireless IDs
Master/Slave: Master unit

Optical Wireless
No, this is a radio transmitter only. 

Auto-Focus (AF) Assist 

AF-assist beam: Yes
Number of AF points supported: 1 (info not provided)
AF-assist beam type: Infra-red
Beam range: 0.6-10m at centre, 0.6 to 5m at periphery

Other Features

High speed sync (HSS): Yes
Second-curtain flash sync: Yes
Modelling flash: Yes (fired with camera’s depth-of-field preview button)
Colour temperature info communication: Yes
Remote shutter release: Yes
Custom function: 8 (3 personal functions) 
Flash settings from camera menus (with compatible cameras only): Yes
External flash exposure sensor (S1, S2): No
PC terminal: No

Batteries & Recycling Time

Battery: 2 x AA batteries (alkaline or rechargeable Ni-MH. Lithium also usable)
The YN-E3-RT II transmitter will run for 10 hours of continuous use on AA alkaline batteries. A power saving function shuts the unit down after being idle for 5 minutes to conserve batteries. 

Build Quality

Dust and water resistance: Yes
Mounting foot material: Metal
Size: 67.4 x 61.5 x 77.4mm (2.7 x 2.4 x 3.0″)
Weight: 110g/3.9oz (excluding batteries)


Canon ST-E3-RT – the original Canon version is the only real alternative if you are looking for a dedicated controller for the RT radio system unless. Of course you can always use a speedlite as a master controller. Canon’s 430EX III-RT is the cheapest Canon option otherwise a couple of Yongnuo speedlites will do such as the Yongnuo YN600EX-RT II or the YN968EX-RT but you could run into possible compatibility issues when controlling more recent Canon speedliits or using recent Canon cameras.

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This page was last checked and updated on the 19 September 2020