Ever think Peter Parker might’ve passed on crime-fighting had he been a good enough photographer? Things might have been different if Peter had a solid DSLR, an iPhone, and Lumu ($99), a digital light meter for shooters with manual ISO, aperture and shutter speed settings. Just plug Lumu into the iPhone’s headphone jack and you’re ready to set the proper lighting for any shot, like say, the Green Goblin terrorizing an ATM. Don’t worry about it Peter, Iron Man will probably get that one.