I believe this thread belongs to "lighting", but if I'm wrong I kindly ask to the moderators to place it into the most appropriate place. I purchased two Y603cMii to play a little bit with a Nissin speedlight I have, I picked the Canon version, and I selected the Mii because apparently they should work with OMD.... but they don't. I'm opening this thread 50% to try looking for a solution, and 50% to warn others evaluating the same triggers. It's just 28 bucks, but flushing em down the toilet is a bad idea. Buy something fun instead, or drink good refreshing beer. The story so far: I configured the triggers according to the instructions, i can trigger the Nissin correctly by using the test button on the transmitter. This means that they are on the right channel, they are properly configured, the batteries are charged, and the flash is correctly placed in M position. Once I place this guy on the OMD hotshoe, nothing happens. The picture is regularly taken, and nothing is triggered. No light switches on, it just sleeps over there. I'm not alone I found evidence on the internet of other similar situations, no one seems to have found a solution. - one video on youtube - one topic on DPreview RF-603II and Olympus not firing?: Micro Four Thirds Talk Forum: Digital Photography Review So what? So nothing, the Yongnuos are just going to be dumped soon. I'll play with it a bit more, google a bit more, post here if I find something. Just wanted to leave a clear indication of this apparently nonsense issue on mu-43 for future reference.