iPhone Duo’s 2x Telephoto Is a Crop, Not a Lens: 12MP at 52 mm From the Main Sensor

The iPhone Duo’s 2x telephoto is not a lens. It is a 12MP crop taken from the center of the 48MP main sensor at 52 mm, and it keeps the main camera’s f/1.6 aperture because it is looking through the same glass. Apple’s own wording is that the 48MP Fusion main camera has an integrated optical-quality 2x telephoto. The 48MP Fusion main camera, the...