Exposure Settings for iPhone 4s?

Hey everyone,

I've had my iPhone 4s for a few weeks now, and I'm really enjoying it. I've been trying to get the most out of the great camera and have gotten a couple of really cool camera apps (Camera+ and DMD). What I'd like to know from the Verge Hivemind is if there is a way to modify the exposure on the iPhone. I haven't found an option to change yet in any of the apps that I have now, and I don't even know if it is even possible to change it.

Do you guys and gals know of any photo apps that will allow me to control exposure? Or do you know of a setting in one of my previously mentioned camera apps that will help me with this?

Thanks in advance for the help!