Canon Speedlite 430EX III-RT

Versatile and High Powered all-round flash unit for Enthusiast Photographers

Take your creative photography to the next level and achieve greater control over lighting with the Speedlite 430EX III-RT flash unit.

Canon Speedlite 430EX III-RT

Canon Speedlite 430EX III-RT

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Beautiful Portraits

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

Bounce Shooting Function

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

Built-in Catch Panel

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

Radio Transmitter

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

Power Source

Powered by four AA batteries.

Transmission Distance

Approx. 30m when there is no interference or disruptions.

Selected shots from the Speedlite 430EX III-RT

    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.