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Strobe triggers, what's what @ Lensrentals blog

 

Radio-signal triggers are useful for long-range triggering. Radio triggers are becoming more and more popular, and for good reason. They generally work very reliably and have a much longer range than infrared triggers. Depending on which type you choose, they can be used with 

both hotshoe flashes as well as studio lighting. While all of them allow shooting in manual modes, there are some that allow for TTL/E-TTL triggering, as well as a few that actually allow full control of lights from the on-camera trigger itself.

With nearly all of the types we carry, you do need a commander for the camera and a receiver for each light. This makes the initial cost of radio triggers more than infrared triggers, but the gain in range, reliability, and flexibility could make up for that, depending on what you’re shooting.