Force 2nd curtain sync

[zuzullo]

Canon 6D and 5D do not allow "2nd curtain sync" for non-canon flashes.
Can ML fix that? Pleaseee!

Canon UI message: "This menu cannot be displayed. Incompatible flash or flash's power is turned off."
Even though, the flash fires, it does always in the 1st curtain

[Greg]

You can buy a trigger YN-622C.

[zuzullo]

You can buy a trigger YN-622C.

Nice one!
But all my other cameras can shoot 2nd curtain sync with any flash. Why Canon cant? Might be just a line in the code missing, no?!

[Greg]

It is difficult, not just one line. 

[Marsu42]

It is difficult, not just one line. 

It is obviously easy in flash M mode, but Canon refuses to do even that - fortunately the new Yongnuo does exactly this using Canon's rt protocol. And has an af assist beam. And is cheaper.

http://flashhavoc.com/yongnuo-yn-e3-rt-released-yn-600ex-rt-coming/

Imho Canon is very lazy on this, the new radio rt protocol which has no fallback to optical (at the same time) would have been the *perfect* time to add remote zoom and 2nd curtain sync with the 2012 cameras as ettl-3.