This new Ring Lite for close-up & macro shooting is loaded with features & capabilities. Now with Canons E-TTL, it takes full advantage of the flash performance of the EOS-1v, EOS-3, & other E-TTL cameras. Circular twin flash tubes can fire at even power, or vary between them over a six-stop range, & one or more 550EX Speedlites can be used as wireless slaves along with the MR-14EX. The controller unit now has an illuminated full-info LCD panel & it accepts optional high-capacity battery packs.