javapop wrote in post #16500450
the Metz 58AF-2 is pretty pricey as well... I really plan on using the flash with my 1D.
If you don't plan on moving the flash among camera bodies, then a Yongnuo YN-568EX might work well for you. But unlike the Metz and Nissin eTTL-II/HSS flashes, there is no way to upgrade the firmware of the unit. So, future compatibility could be an issue. If you're fine rebuying a flash if it turns out that the YN isn't compatible with the as-yet-non-existent camera body you upgrade to from the 1dMkIII, then I wouldn't worry about it.
Just as an example, I have a 580EXII and a YN-568EX. Both of them work with full function on my 50D and my 5DMkII. However, on my Powershot G9's hotshoe, the YN-568EX won't even fire, while the 580EXII is fully compatible with the G9's flash control features. It's clear the Powershot hotshoe is not identical to the dSLR hotshoe, but Canon engineered their flashes to work with both. Yongnuo has probably only reverse-engineered the dSLR hotshoe signalling protocol.
If you eventually want to mix Canon RT gear with Yongnuo gear, it may be compatible, it may not. But that doubt is pretty much removed when you go all-Canon. Whether it's worth the cash to you or not is a matter of how much spare cash you have to fling about on gear, and how long you tend to hold onto and use your gear.
Sorry, that's not an official name--just my shorthand way of referring to any of the Canon speedlite models with EX in the name: 430EX, 430EXII, 580EX, 600EX-RT, etc.