A mobile device case for coupling around a mobile device that includes a miniature camera module has defined therein a lens attachment aperture shaped both to permit light from an object to be captured as a digital image to travel along the optical path of the miniature camera module to a built-in image sensor of the miniature camera module of the mobile device, and to facilitate stable coupling of an auxiliary lens in optical alignment with the miniature camera module. The case comprises electric circuit components positioned to balance an attached auxiliary lens approximately at a grip location.