tl;dr: Photosynthesis is an iPhone camera app that fires two lenses simultaneously (e.g., main + telephoto, or main + ultra-wide) and fuses the captures into a single photo, combining the wide field of view of one lens with the real optical detail of the other—no generative AI. It supports iPhone 11 and later, includes an editor with alignment/ghosting correction and exports to formats like layered PSD and spatial 3D. It's free with a 5-export/month limit, with a subscription or lifetime unlock for unlimited exports and pro features.