If you’re a serious iPhone photographer, ExoLens’ new Case for iPhone 7 ($50) could very well be the final piece you’ve been waiting for. While we were very impressed with the lens in the ExoLens PRO with Optics by ZEISS Wide-Angle Lens Kit that we looked at last week, the main downside of the Pro kit is that you have to take off your case — or simply go caseless — to use it, risking your iPhone in the process. Fortunately, for…