A free program for Android, by accordion.

ReLens is a free, mobile app that lets you apply professional-grade effects and AI to your photos. With it, you can make edits and improve images like a professional, even on a smartphone. The app is easy to use, so even if you have no previous experience with photo editing, you can quickly start making changes to your photos.

The app is based on computational photography, which is a technique that uses mathematical methods to simulate the effects of a lens. This allows you to apply the effects of different types of lenses to your photos, and get a realistic effect.

The app supports a number of different lenses, including the popular DSLR lens.