Quote Originally Posted by Jarhead5811
Anyone familiar with this light? Is it a wireless master?

I do not own one, but yes, it can function as a master flash.


Quote Originally Posted by Jarhead5811
IF, it is at least as capable as aST-E2.

As far as I can remember, the ST-E2 can control two groups of flashes (A & B). The 580EX/580EX control three. (A, B, & C). I do not know how many the MR-14EX can control, but the Macro Twin Lite MT-24EX can control three (A, B, & C).