Canon has announced an update to the popular Speedlite 430EX line of flashes, this one dubbed the Speedlite 430EX III-RT. The most significant change to the flash is reflected by the “RT” designation: it contains a radio transceiver to be compatible with Canon’s proprietary RT flash system. The 430EX III-RT can be used as a master or a slave in the RT system, much like the 600EX-RT. Like other RT system flashes, Canon claims that the radio system is reliable at distances up to 30 meters (about 100 feet). It’s also still compatible with the older infrared iTTL system at shorter distances, but it can only be used as a slave.
Aside from the radio control, the Canon strobe has a couple of new features:
it ships with an orange (CTO) snap-on filter to match incandescent lighting or for other creative effects
it has a built-in catch-light (fill-card) that slides out of the head like (like the 580 and 600 series)
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