I reviewed Sandmarc’s Photography Edition last Fall, which includes their Wide Angle, Fisheye and Macro lenses, and came away very impressed with both the quality of the lens construction and the images produced. While this 3-lens collection set does a lot to expand the functionality of the iPhone’s camera, the one thing missing was zoom enhancement.
In a short period of time, Ztylus has cemented their reputation of being on the cutting edge of iPhone camera extension accessories. I personally own their Revolver case and lens system, and have been very impressed with it. While it works with my iPhone 7 Plus, it only works with the wide-angle lens.