just to see what would happen. Now I see firsthand the pitfalls people run into when they allow the camera to make all the decisions for them. Frankly, I wonder how ANYBODY can get a good shot using 'green box' mode other than by pure dumb luck.
My subjects were simple: A tree; the license plate on my son's car; hanging flower pot on deck.
I just wanted to see what camera settings and focus points the camera would choose. What I found:
1. The camera usually chose a much slower shutter speed than I would have selected. Sometimes as low as 1/60 on the shutter. Any question why POTN sees so many 'why are my shots blurry?' posts from people who use their cameras this way?
2. Camera chose good aperture values; I'm guessing that the camera can approximate subject distance AND background distance to make a reasonable choice.
3. 5D2 always selected auto ISO which I don't approve of. You don't know what ISO setting was chosen until you look at the image data AFTER the shot is taken.
4. Focus points. This is the biggest detriment to allowing the camera to make the decisions. Inside the view finder was nothing short of a blinkfest with focus points randomly shifting and lighting. Also didn't see a way to lock and recompose ... the focus just kept randomly changing at the camera's slightest movements.
Conclusion: Using a 5D2 on full auto mode meant:
License plate on car was blown out and not sharp because camera selected 1/60 on shutter.
Tree shot grabbed focus on leaves nearer the lens when focus finally locked which is not what I wanted. Tried, but could not get intended focus point to stay put.
Potted plant shot was ok because I was far enough away that it was perfectly clear to the camera that it was indeed the intended target.
Editorial: I certainly understand how people can purchase a decent, (and expensive) DSLR and get bad results using full auto mode. My Canon A540 point and shoot would probably produce better results in full auto than the 5D2 due to its simplicity.
This was a first time test for me. Thankfully, this place taught me the benefits of shooting in manual when I got my 30D three years ago.
dave



