Thanks Cobra and Gonzo! It makes perfect sense now. So basically if I put the camera in manual after taking the ambient exposure I desire (say of the background), the flash will automatically add enough light for the foreground/subject through ettl. So, tell me something guys - isn't it wiser in that case, to use the maximum aperture your lens can afford - say 2.8, so that the flash does not drain all its power and suck in too much battery. I know it also depends on the max sync speed, but with ettl you can always use HSS. But again, using HSS will suck in more battery I guess? What's the perfect setting in your opinion as far as meter reading is concerned when shooting say at a Beach?
Yep sounds like you have it all figured out now. I set my aperture depending on how much of the background detail I want in the shot and don't worry about batteries, a set of batteries usually last me at least 2 shoots anyway but I do always have extras in my bag just in case. I will add that with smaller apertures HSS becomes much less useful, which has me seriously considering picking up an alienbee.






