The iPhone 18 Pro carries a 48MP Fusion Main camera with Apple's first mechanical variable aperture, running four settings from f/1.48 to f/4 on six laser-cut blades. Opening from f/1.8 to f/1.48 gathers about 48 per cent more light, which is Apple's 50 per cent claim. The iPhone Duo keeps a fixed aperture and adds four two-screen shooting modes.