The EF-140S Electronic Flash from Sigma is optimized for use with the DP Quattro camera line but is compatible with cameras featuring Sigma’s S-TTL. The flash will offer coverage for a 19mm lens in the APS-C format and it has a recycle time of approximately 5 to 6.5 seconds. This includes flash exposure compensation from -3 to +3 EV in 1/3 EV steps. Also, on the rear of the flash is an LED that will indicate when it is ready to fire. Included with the flash is a drawstring carrying pouch and it will run on 2 AAA batteries. Manual control is possible through in-camera controls.
The Speedlite 600EX II-RT sits at the top of Canon’s on-camera E-TTL / E-TTL II compatible flash lineup with a powerful guide number of 197′ at ISO 100 and 200mm. The two-way 2.4 GHz radio system provides added reliability and a range up to 98.4′ among up to 5 groups with a total of 15 individual Speedlites. This system also does not need direct line-of-site like traditional optical-based transmission and will work through obstacles. Also, the unit can tilt from -7 to +90° and rotate 180° either left or right for complete bounce capabilities. On the back of the 600EX II-RT is a backlit dot-matrix LCD panel that displays the status and allows users to easily access and change settings. Additionally, the flash is durable with a redesigned contact construction and improved dust and water-resistant sealing. Other capabilities of the 600EX II-RT include a stroboscopic mode as well as high-speed, first and second curtain sync settings for more control over your image’s final look. It comes with a bounce adapter, a hard CTO filter set, a mini stand, and an updated soft case that holds the flash and accessories.