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Hi All, I posted this question in an underwater photography forum, as that's my focus, but didn't have much success in getting responses. Maybe it's too technical a question, but I thought i'd try again in different forums. I'm working to understand how my a6000 works in detail with the aim of (possibly) making my own LED TTL converter. At the moment I use the a6000 with its internal flash to trigger a set of underwater Sea & Sea YS-D2 strobes using my optical cables. I either use the strobes in manual or TTL mode. The TTL is reasonable, but not always perfect. I wanted to understand how the a6000 TTL system works, so I connected a little oscilloscope to my hotshoe x-sync pin and used the other channel of the oscilloscope with a photodiode to monitor the flash. See attached 2 screen grabs for two flash types - Fill Flash, Rear Sync. I also did a slow sync, but it's result was remarkably similar. I wasn't able, in any case, either Manual, Aperture priority or full automatic, to witness any pre-flash whatsoever from the camera's internal flash. Does the a6000 meter TTL during the exposure? Am I missing something here. Welcome any insights, comments or suggestions to be able to run another oscilloscope test. Cheers!

As a yet another Canon turned Sony user, I have a fair amount of gear that seems to have survived the transition so far. Loving my A7II so far. Lighting, however, remains a sore subject. I'm disappointed to find that HSS and TTL are not supported from my current Yongnuo 568II flashes, and this seems a common theme in general regardless of brand or model. I'm hoping that now that we're here at late 2015, there are some better choices that my initial googling have not yet revealed. Obviously looking for remote power control and HSS, but would love TTL too. Also wanting cross compatability with at least Canon and Sony. Cherry on top would be an LED modelling light. 1. I know the Nissin Air system has just been released, but this involves me buying all new flashes, restricting myself to sony only, and there are no triggers available for it yet/ 2. I'm wondering if Paul C Buff Einsteins are the answer? Anyone have any experience with them and the sony alpha, specifically going for times around 1/8000? I don't think they do TTL though. 3. Seems there are a lot of cheap chinese ebay strobes now. I'd be open to trying one out if someone can recommend one based on experience. 4. Odd question but can you mix trigger systems? Like if I got Phottix Odin's can I have a sony TCU, but then use Canon triggers for my Yongnuos? Open to suggestion too, just trying to get something cross system without having to buy two systems. Thanks!