Hi, I have a Nissin i40 flash and want to use it off-camera on my E-M1 in TTL mode with a cable for some macro work. I've been doing lots of research and whilst the Olympus FL-CB05 will 100% work, it's very expensive. I've seen a variety of cables and discussions. The JJC cable doesn't seem to work on the E-M1. And also mixed reports about the Canon TTL flash cables working on the E-M1 Can anyone recommend a cheaper cable that will definitely work?