Al Rohrer wrote in post #12778421
Only time I've used Auto ISO on my 5D MkII was at my 45th High School Reunion. Light was adequate but varied according to where you were in the room. Since I was shooting for my personal use and didn't want to worry about camera settings, I tried the Auto ISO setting and was very pleasantly surprised by the results. I'm looking forward to using it more in the future.
Have to agree here. I didnt know about it either until a very respected sports photographer told me about it and specifically how he uses it in his work flow. Im blown away with how it works in TV mode and im applying the techniques to our wedding photography work. IT WORKS.
Look , we all know what shutter speed we need to freeze action 99% of the time. We know that we dont want to handhold below 1/60 and we know flash is going to freeze motion so anything over 1/320 will likely not have motion blur. Auto iso takes a lot of problems out of the equation. In TV mode, you set the shutter speed at 1/320 (just an example),, the camera is going to set aperature. Auto iso allows the camera, who is a hell of a lot smarter than i am, to get the correct settings and coordinate with that flash, especially with ETTL flash operations.
I think you guys should give it a try and be as pleasently surprised as some others are finding out. Its a great tool to use once you understand what it can do for you. I frequestly set up our 2nds camera this way with the 135L attached during a ceremony. I know i need a shutter speed of 1/160 to get good results with the 135L. TV mode at 1/160, auto iso during a ceremony with no flash gets us great results especially if we have changing lighting, which is very common in churches and outdoor vents. Even better results when we can attach a flash. Its a good tool to use.
Get Syl Arenas' book-- speedlighters handbook. It will open your eyes. I was a 100% manual shooter who has completely changed my thoughts about the way we will cover events since reading this book.
Auto iso is a good thing but not a 100% problem solver. It is a great tool. I love it. If you have a camera that does this, you should learn how to use it.