Canon Speedlite 430EX III-RT Flash

The 430EX III-RT external flash unit makes light control more manageable and versatile.

The head is able to turn freely up to 90° up, 150° to the left, and 180° to the right.

A built-in catch light panel delivers light that reflects in the subjects eyes to add life to portrait images

This model supports not only optical but also radio transmission for off-camera wireless flash shooting.

Approx. 30m when there is no interference or disruptions

Detailed Specifications

Speedlite 430EX III RT Technical Specifications


E-TTL II/E-TTL autoflashShoe-mount Speedlite
Compatible cameras
Type-A EOS cameras (E-TTL II/E-TTL autoflash)* Autoflash is not possible when using Type-B EOS cameras.

Flash Head

Guide No
Approx. 43/141.1 (at 105 mm flash coverage, ISO 100, in meters/feet)* Without color filter or bounce adapter
Flash Coverage
Supports a shooting angle of view with a lens focal length of 24-105 mm (with wide panel use: 14 mm)• Automatic setting (Automatically sets the flash coverage depending on the shooting angle of view and the image sensor size.)• Manual setting
90° up, 150° left, 180° rightBounce adapter provided can be used
Flash duration
Normal flash: Approx. 1.8 ms or less, Quick flash: 2.3 ms or less
Color temperature
Yes (lens shift-type), approx. 3.5-stop [13].
information transmission
Intelligent IS with 5-axis Advanced Dynamic IS
Color filter
Color filter provided can be used

Exposure Control

Exposure control system
E-TTL II/E-TTL autoflash, manual flash
Effective flash range (with EF50mm f/1.4 lens at ISO 100)
Normal flash: Approx. 0.7 - 23.6 m / 2.3 - 77.4 ft.Quick flash: Approx. 0.7 - 13.6 m / 2.3 - 44.6 ft. (at Guide No. 19.1/62.7, in meters/feet)High-speed sync: Approx. 0.7 -12.8 m / 2.3 - 42.0 ft. (at 1/250 sec.)
Flash exposure compensation
±3 stops in 1/3- or 1/2-stop increments
FE lock
Possible with the camera's Multi-function button or FE lock/AE lock buttons
High-speed sync
Possible* During radio transmission wireless shooting, high-speed sync is possible only with EOS DIGITAL cameras released in and after 2012 (except with EOS 1200D)
Manual flash
1/1 - 1/128 power (1/3-step increments)
Modeling flash
Fired with camera's depth-of-field preview button or Speedlite's test flash button

Flash Recycling

Firing interval (Recycling time)
Normal flash: Approx. 0.1 - 3.5 sec.,Quick flash: Approx. 0.1 - 2.5 sec.* When using AA/LR6 alkaline batteries
Flash-ready lamp
Lights up in red: normal flash availableLights up in green: Quick flash available

AF-Assist Beam

Emission method
Switchable in Personal Functions between Intermittent flashes (a series of small flashes) and Infrared AF-assist beam
Emitting small series of flashes
Supported during viewfinder shooting, and Quick mode during Live View shooting or movie shootingEffective distance: At center: Approx. 0.7 - 4 m / 2.3 - 13.1 ft.At periphery: Approx. 0.7 - 3.5 m / 2.3 - 11.5 ft.
Infrared AF-assist beam
Center AF point in viewfinder supportedEffective distance: Approx. 0.7 - 8 m / 2.3 - 26.2 ft.

Optical Transmission Wireless Slave Function

Connection method
Optical pulse
Wireless settings
Ch. 1 - 4
Slave unit setting
Firing group A, B, C
Reception angle
±40° horizontally and ±30° vertically, facing the master unit
Slave flash charge indication
AF-assist beam emitter blinks and flash-ready lamp lights up on the slave unit

Customisable Functions

Custom Functions
10 types
Personal Functions
430EX III-RT: 8 types / 430EX III: 6 types

Radio Transmission Wireless Master/Slave Function

2405 MHz - 2475 MHz
Modulation system
Primary modulation: OQPSK,Secondary modulation: DS-SS
Wireless settings
Auto, Ch. 1 - 15
Wireless radio ID
0000 - 9999
Slave unit control
Up to 5 groups (A, B, C, D, E), up to 15 units
Slave unit setting
Firing group A, B, C, D, E
Transmission distance
Approx. 30 m / 98.4 ft.* When there are no obstacles or obstructions between the master and slave units with no radio interference with other devices* Transmission distance may be shorter depending on the relative positions of the units, surrounding environment, weather conditions, etc.
Flash ratio control
1:8 - 1:1 - 8:1, 1/2-step increments
Slave flash charge confirmation
Flash ready icon lights up on the master unit's LCD panel, AF-assist beam emitter blinks and flash-ready lamp lights up on the slave unit
Linked shooting

Power Source

Speedlite power source
Four AA/LR6 alkaline batteries* AA/HR6 Ni-MH batteries can be used
Battery life (number of flashes)
Approx. 180 - 1200 times* When using AA/LR6 alkaline batteries
Radio transmission wireless shooting time
Approx. 9 continuous hours* When Master flash firing OFF, using AA/LR6 alkaline batteries
Auto power off
Power off after approx. 90 sec. of idle operation* When set as radio transmission wireless master unit, or in linked shooting: approx. 5 min.* When set as slave unit: approx. 60 min.

Dimensions and Weight

Dimensions (W x H x D)
Approx. 70.5 x 113.8 x 98.2 mm / 2.78 x 4.48 x 3.87 in.
430EX III-RT: Approx. 295 g / 10.41 oz.,430EX III: Approx. 290 g / 10.23 oz.(Speedlite only, excluding batteries)

Operating Environment

Working temperature range
0 °C - 45 °C / 32 °F - 113 °F
Working humidity
85 % or less


Speedlite 430EX III RT
All specifications above are based on Canon's testing standards.Product specifications and the exterior are subject to change without notice.

Regular price $395.00
Sale price $395.00 Regular price $436.00
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Product Overview

The 430EX III-RT external flash unit makes light control more manageable and versatile.

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