[Pre Order - allow extra time] Yongnuo YN690EX-RT TTL Speedlite for Canon Compatible with Canon E-TTL / E-TTL II, Guide Number 196.85' at ISO 100 & 200mm, Zoom Range: 20-200mm, Wireless Master/Slave TTL Functionality, Tilts -7 to 90°, Rotates 180°, 1...