If you use an iPhone then chances are you’ve used Camera+ by Tap Tap Tap. Camera+ is an excellent application that provides more information and allows additional features above and beyond what the basic camera application provides. Burst Mode, Flashlight Mode, Displaying ISO, Aperture, and Shutter time, in-application photo editing and touchup, etc… The biggest issue and disappointment for me when it comes to the iPhone and it’s built in camera application is low-light performance.
In many situations, with steady light, the iPhone camera works beautifully but in situations where the phone flashes the LED once to get exposure, then once again to actually take the picture I’ve found pictures are often washed and way over-exposed or very under-exposed. Only about 1 in 20 images I’ve ever taken with the default application in low-light that required the LED flash came out decent.