I have been doing some reading using the search function, but I'm still trying to learn my 430EX and the basics of using external flash. I read my manual but it did not explain E-TTL very well. According to Big Mike's quote from another thread, from what I understand, E-TTL is basically the Automatic mode for the flash. Is that an accurate statement?: I did some test shots in Manual Mode varying the power of the flash and I could not tell a difference in brightness from one exposure to the next. Does anyone know why this might be? I'm still having a lot of trouble grasping all the features of my 430EX even after reading the manual. Does anyone know any websites that explain external flash really well?