Experiments with the 'Ollolens' for iPhones, using the Cortex camera app. The bridge (1/2 mile distant) shows strong coma on the lights, and even though the coma is worse than with the iPhone's lens alone, even the $11000 USD Leica Noctilux has significant coma wide open, so no biggie for me. The calendars are cropped from the originals - the default iPhone 6s lens, and then with the Ollolens mounted for the 2x magnification. The iPhone 6s-plus has an effective FL of 29mm approximately, so the Ollolens bumps that to 58mm, and I found the 2x magnification to be very accurate (in terms of being 2x bigger). If you can't get closer to your subject with the iPhone and thus have to crop the image 2x or more, the Ollolens will yield a much better resolution, ignoring any soft edges or coma. iPhone 6s-plus, Cortex app, Ollolens. iPhone 6s-plus, Cortex app, default lens (1x). iPhone 6s-plus, Cortex app, Ollolens (2x).