I've discovered consistent focus problems using Rebel XSi + 430EXii + Tamron 28-75. I confirmed this is a common problem which occurs when the Speedlite's AF-Assist is enabled.
Some have suggested that the red color of the AF-Assist light causes the Tamron lens to have problems. So, I am considering removing the translucent red plastic cover that goes over the AF-Assist light. However, I don't want to bother doing this if the actual LEDs are red as well.
Can anyone confirm what color the actual LEDs are on the 430EXii AF-assist?