For sophisticated wireless flash setups, theres nothing like the new Speedlite Transmitter ST-E3-RT. Facilitating radio controlled, two-way wireless transmission up to 98.4 feet, among up to five groups or fifteen individual Speedlites, the ST-E3-RT represents the next generation in wireless flash…

Macrolite adapter; to attach the ML-3, MR-14EX or MT-24EX flashes to most lenses with this filter size.

This serves as an optional replacement or backup battery magazine for the Compact Battery Pack CP-E4.