PIXAPRO® PRO ST-III S T 2.4GHz Flash Transmitter Only (FOR SONY) | Essential Photo | Photographic lighting and equpiment
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PIXAPRO® PRO ST-III S T 2.4GHz Flash Transmitter Only (FOR SONY)

Product Code: M-060020   Availability: In stock
£44.99 inc. vat

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Product Information

PLEASE NOTE: This video is not full a representation of what is included in this listing as some items are used for demonstration purposes only. Please see the “Specifications” tab for information on what this listing includes.

The PIXAPRO PRO ST-III S is a 2.4GHz Radio flash trigger system capable of transmitting TTL information designed for use with Sony cameras and flashes compatible with Sony’s TTL system. The PIXAPRO PRO ST-III S trigger set has a transmission range of approximately 100m in an open area, and since the transmitter and receivers use radio waves as opposed to Infra-red, you don’t need direct line of sight, and is not affected by bright Sunlight which can sometimes cause problems with optical slave systems.

As well as the traditional Sony A:B C ratio style interface, the PIXAPRO PRO ST-III S also has a full GR Group style interface allowing up to 5 Groups to be individually set to either TTL, Manual, or Off. You also have the ability to mix TTL and Manual Groups if needed, which makes the PRO ST-III system very versatile. The ST-III system also has 32 separate channels, which enable you to use your ST-III trigger system in the vicinity of other photographers, without fear of accidentally triggering each other’s lights.

The PIXAPRO PRO ST-III S supports TTL, HSS (High Speed Sync) and even has a HSS Pre-sync Timing Adjustment feature, which is great for those times where you need to increase your shutter-speed beyond your camera’s sync speed.

It also features a PC sync cable socket enabling it to be used to trigger studio strobes, as well as a Micro USB port to enable you to update the ST-III’s Firmware as new technologies become available.

The perfect solution for the busy photographer who require a reliable TTL radio trigger system.


  • ST-III Trigger is designed for use with the CITI600TTL or any of the Hybrid360TTL Models which have a built-in ST-III receiver. Use with other flashes require a separate receiver.
  • Your CITI600 or Hybrid360 TTL Flash may require a Firmware Update for compatibility with the ST-III S trigger for Sony, Please Contact Us for the latest Firmware Update.


  • Large 100m Transmission Range
  • Supports up to 5 Groups and has 32 different channels
  • Supports High Speed Sync up to 1/8000th sec.
  • Can also be used as a Wireless shutter release
  • Large LCD Display
  • Powered by 2x AA batteries


  For instructions on how to set up and use this product, Please Click Here. 

  For more information about how High-Speed Sync works, Please Click Here.

Godox X1STTL X1S TTL X1 -S




TTL Flash

TTL Autoflash

Radio Frequency

2.4GHz Transmission

Power Supply

2x AA Batteries

Manual Flash Triggering


High-Speed Sync Support


Working Range

100m (In an Open Area)




5 in GR Grouping Mode

3 in Ratio Grouping Mode

Transmitter Dimensions


Receiver Dimensions


Transmitter Weight


Receiver Weight






PRO ST-III S Transmitter



Delivery Information

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Mainland services

We are a UK based dealer, all items are in stock and ready to dispatch. Once the order has been placed, we aim to ship out your products within 24 hours. Providing the product is in stock, items will be shipped within 24hours of receiving cleared payment. For all orders placed before 2:30pm Monday to Friday, same day collection will be arranged. We ship our lighting kits by Interlink Express and Parcelforce. All can be tracked and can take 1-2 ... Read More

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EssentialPhoto is committed to the provision of quality and reliable products and outstanding customer service. Buyers are entitled to cancel your order and return the goods within 30 working days for a full refund of the purchase price of the goods, please contact us at customerservice@essentialphoto.co.uk

The following returns procedure and policy should be followed:

1.     Buyer shall contact us at customerservice@essentialphoto.co.uk prior return.

2.     Buyer shall fill out the Return Form, found above. 

3.     Buyer shall email the application form to customerservice@essentialphoto.co.uk, also including a copy with the return order.

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Questions & Answers


Our flash triggers are not compatible with PocketWizard triggers unfortunately.

The Built-in flash trigger on the Sekonic Flash Meters, are also not compatible with our triggers, however you can still meter the flash by pressing the "TEST" button on the flash trigger. Most flash meters have a mode where it will wait a certain amount of time after the mesure button has been pressed for a flash to fire. Simply put your meter into this mode, press the "Measure" button on the meter, and then press the "Test" button on the trigger to fire the flash so you can get your exposure reading (Please refer to your flash meter's manual for more details).


Please see image below which shows which switch configurations represent which channels on the ST-III Trigger system. Please Note: Your ST-III must be set to manual mode to work with PRO AC 2.4GHz receiver. Not compatible with older 433MHz Receivers.


The 1/256th power setting isn’t available by default, you have to enable it in the Custom Functions menu (CFn). To enter the custom functions menu, press and hold the <CH> or <CH/OK> button (depending on which batch your trigger is from) for a few seconds and the custom functions menus should come up. Once in the Custom Functions menu, scroll to CFn. 5 and press the <GR> button, and the option will flash. Use the scroll wheel to select the 1/256 power setting, and then press the <GR> button again to set it. To go back to the main menu, press the <Menu> button.


It depends on whether your camera has the old style, or new styled Sony hot-shoe. If your camera has the new styled hot-shoe, then you shouldn't require an adapter. If your camera has the old styled hot shoe however, you will require a hot-shoe adapter of some description. (Please see photo below).

PLEASE NOTE: If you require TTL or High-Speed sync, please check that the adapter you purchase is capable of transmitting TTL data.

Sony hot-shoe types


To restore your ST-III back to factory settings, press and hold the button whilst turning the Transmitter on.


You have to set the Flash Exposure Compensation (FEC) from the transmitter itself, and not the flash, however the FEC will not be displayed on the speedlite itself.


Please upgrade the firmware of your transmitter (ST-III C for Canon - V15 or later, ST-III N for Nikon - V16 or later, ST-III S for Sony - V13 or later). To activate the super close (30cm inside) trigger option, hold down the TEST button and switch on your ST-III trigger until the STATUS indicator flashes twice. After release, you can access this option from the wireless remote control 0-30 meters.


The Auto-Zoom feature will only work when trigger is flash is set to auto (A) mode. The Auto zoom is disabled when use in manual (M) mode.


If you set the "electronic front curtain" to the "off" state in your camera menu, it should resolve the problem.


1) Please ensure there is no physical material in/on the hotshoe, especially around the pins at the back. 2) Please ensure the pins on the transmitter are aligned with the contact point of the sony hotshoe, and none are misaligned or bent incorrectly. 3) Ensure the transmitter is inserted fully into the hotshoe and secured by the tightening nut. Sometime, this requires a little force, as the fit is a little tight. 4) Reset it by turning the camera and/or trigger on/off. 5) Change with a new pair of battery. 6) Please ensure the hotshoe protector, came with all Sony A series camers, on at all times when not using the hotshoe. Keep it protected from any moisture, humidity, etc. All these can cause poor degradation overtime and then result poor contact.


To check which version of the Firmware Version you have installed on your ST-III trigger: Switch the power off, then press and hold the button, and then switch the power back on whilst still holding the button.

To check which version of the Firmware Version you have installed on your ST-III Receiver: Switch the power off, then press and hold the button, and then switch the power back on whilst still holding the button.

Your Current Firmware Version should then be displayed on the screen like as shown in the photograph below.


Whilst you won’t be able to use the hybrid360 ETTL or ITTL on camera, they will work off camera no problem. However, you may need to update the firmware of your Hybrid360 ETTL/ITTL flash. If you need the latest version of the Firmware, please contact us at customerservice@essentialphoto.co.uk for the link.


The Hot Shoe on the trigger allows you to use a feature known as TTL Pass-Through, which enables you to use your ST-III trigger and a TTL speedlite on camera simultaneously. Perfect for times when you still need a speedlite on camera as a fill light etc.


No, that doesn't work unfortunately. The master flash requires some kind of physical connection to the camera’s hot shoe in order for that to work. You can either sit the master flash directly on the camera’s hot shoe, or use an off-camera TTL flash cord.

The only way around it would be to use one of the following solutions:

  • Place a speedlite, set to master mode on top the ST-III trigger’s hot shoe, whilst the ST-III trigger is on camera.
  • Purchase another ST-III receiver for the other speedlite.
  • Purchase an Off Camera TTL cable for the Master flash to sit on.


Yes you can use our ST-III S trigger with a Sony camera with the old styled hot shoe, however you will require Sony ADP-AMA Hot Shoe Adaptor which will convert the older styled hot shoe into the current style (please see image below).

Sony ADP-AMA Hot Shoe Adaptor

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