I bought some Hähnel Captur triggers, but can’t get off-camera flash to work
Don Boyd, Aintree
Brian Says… Your Captur triggers are relatively simple devices that only send a signal to the flash telling it to fire in sync with the shutter. There’s no clever automation. Despite it being a radio trigger, it cannot trigger the radio-capable Speedlite 430EX III-RT without another Captur receiver on the flash. Each flash will need a receiver, and you will need to set the flash power manually on each one. There is no automatic flash exposure, however the Captur trigger will work outside in bright light over a reasonable distance.
If you are planning to work indoors, then the built-in flash on your EOS 760D can be configured as a master, sending control signals to each of your flashes. This is an optical wireless system and each flash needs to be able to ‘see’ the light from the camera’s built-in flash. The camera can be configured to control the flashes in up to two separate groups. Optical is not ideal outside in bright conditions as the off-camera flashes may struggle to see the light from the camera.
If you are working inside, I would suggest foregoing the Captur triggers and using optical wireless with the camera as the master. You will need to set each of the flashes as a slave, and assign them to group A or group B if you wish to control them differently. From the camera you will be able to choose either automatic E-TTL flash or to set the power of the respective flashes manually.
The key to successful off-camera flash work is to know your gear and work out how you prefer to operate; automatic flash exposure is straightforward but is influenced by your subject, manual is harder initially but inherently consistent, offering a reliable and repeatable way of working, so you’re in complete control.