I got my two last week. I have the 5DII. The group mode doesn\'t work as mentioned above, and if you want to use manual flash, you have to use ratios, like A:B or A:B and C, rather than manually setting the individual power levels via radio. That\'s essentially the same as the optical link of the 580EXII in that regard (but is radio now). Because the group function doesn\'t work, you can\'t mix ETTL and manual groups, and you are limited to the 3 A, B, C groups of yesteryear basically. But still good enough for me.
I\'m relatively certain, as I recall, that it sync\'s up to 1/200 (camera\'s normal top sync speed) without the dreaded curtain effect. It not only does HSS on the camera up to 1/8000, but also seems to work fine in the radio mode, which was not advertised to be the case.
So all in all, it\'s a great upgrade which will work a bit better on newer bodies. I doubt it will make much difference to many folks, as you have to own a fair number of these to start worrying about more than 3 groups, and these are obviously very expensive. (BTW, Buydig sells these for $599 now with free shipping.) It would be nice to control the flashes in manual without the ratios, but that will have to wait for now, until I sell the 5DII.
I got my two last week. I have the 5DII. The group mode doesn\'t work as mentioned above, and if you want to use manual flash, you have to use ratios, like A:B or A:B and C, rather than manually setting the individual power levels via radio. That\'s essentially the same as the optical link of the 580EXII in that regard (but is radio now). Because the group function doesn\'t work, you can\'t mix ETTL and manual groups, and you are limited to the 3 A, B, C groups of yesteryear basically. But still good enough for me.
I\'m relatively certain, as I recall, that it sync\'s up to 1/200 (camera\'s normal top sync speed) without the dreaded curtain effect. It not only does HSS on the camera up to 1/8000, but also seems to work fine in the radio mode, which was not advertised to be the case.
So all in all, it\'s a great upgrade which will work a bit better on newer bodies. I doubt it will make much difference to many folks, as you have to own a fair number of these to start worrying about more than 3 groups, and these are obviously very expensive. (BTW, Buydig sells these for $599 now with free shipping.) It would be nice to control the flashes in manual without the ratios, but that will have to wait for now, until I sell the 5DII.
Here\'s a photo from my daughter\'s prom night last week with on camera fill flash at 1/200 sync speed, ETTL, uncropped:
