Smartphone camera tech is serious business for Nokia. They made that clear when they announced the PureView 808, which had an F/2.4 lens and a clever high-megapixel sensor that promised much better low-light performance. Unfortunately, it was thwarted by a dated operating system. Now, however, Nokia has crammed a 41-megapixel sensor and an F/2.2 lens into their new Windows Phone-powered Lumia 1020. It looks promising.