Have you experimented with speedlite photography yet. To see how your pictures will come out. Canon's E-TTL algorithm works differently depending on what mode your shooting in. In Full Automatic and other Semi Auto Modes. Flash is all treated as Fill Flash ONLY not main light. In Manual Mode flash is treated as main light NOT Fill Flash. In order to change flash settings this must be done in the speedlite control menu. Since the EL-100 lacks on speedlite controls. Newer higher end speedlites offer and LCD screen to change settings along with support for the speedlite control menu. Your camera is classified as a "Type A" camera and also supports E-TTL II. E-TTL II is a revised version of the original E-TTL algorithm that was released in 1995. There is NO such thing as an E-TTL II speedlite. All of Canon's EX or EL speedlites support both. Its the camera body that uses E-TTL or E-TTL II.
-Demetrius
Bodies: EOS 5D Mark IV
Lenses: EF Trinity, EF 85mm F/1.8 USM
Retired Gear: EOS 40D, EF 50mm F/1.8 STM & EF 70-210mm F/4
Speedlites: 420EX, 470EX-AI, 550EX & 600EX II-RT
