Regular Flash, Hot Shoe Mount, Guide Number: 174 @ ISO 100 (105mm.), Dedicated, 24 - 105 mm.
Sigma EF-530 DG SUPER for Canon TTL Flash - The EF-530 Super DG is Sigma's flagship TTL flash, and has been updated with improved coverage range and a stronger power output. It features a powerful Guide Number of 174'/53 m at 105mm, and covers a focal range from 24mm to 105mm.