I’ve been waiting for someone to do something like this. In fact, I briefly considered doing it myself. That is, building a diffusion dome to snap onto an iPhone in order to turn it into a full fledged incident light meter. Sure, there are already light meter smartphone apps, but they usually involve taking a picture and then deciphering the values in order to determine a good manual exposure to translate to your DSLR. But it’s the addition of the simple device, a diffuser that fits over the iPhone’s front camera, that makes this look and function like a real life light meter. Now, if they can figure out how to turn the next generation into a flash meter, I’ll be even more excited. For $30, this might just be my favorite iPhone accessory. Check it out at Photojojo.