New answers tagged speedlite
If the camera is triggering the flash in Manual flash mode, then it should also be triggering it in E-TTL flash mode. My guess is that the Flash Exposure Compensation (FEC) setting accidentally got adjusted too low. Another possible issue is that a highly reflective object was introduced to the scene. Possible items could be the highly reflective tape used ...
The 580 EX II supp and the 430 EX II both support ETTL II. The 550EX only supports ETTL. Since you already have an ETTL II device, you'd be handcuffing it by going down to ETTL I. I have both a 580 EXII and a 430EXII and I love it. Shooting ETTL can be great when you don't have time to play with manual flash settings, and ETTL II improves upon that. I love ...
Considering that the 550EX was introduced in 1998 while the 430EX II was introduced in 2008, the 430EX II seems the safer bet if you're working with a modern DSLR. Speedlites do wear out over time; parts like the flash tube and capacitors are bound to fail eventually, and the zoom mechanism is also subject to wear and tear.
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