The iPad has made its way into a large number of photographers kits. It's great for low-level editing, and perfect for quickly showing off your images to people outside of the studio. But can a simple app let it double as a softbox?Over the weekend we read about an app called Softbox Pro which Lifehacker noted was pretty much just a series of images that could be easily and freely replaced with digital files. There are other, similar apps available, but I was more curious how well they work. We've seen someone replace an entire studio light setup with iPads, but can a single iPad do any heavy lifting?