PocketMeter Pro turns your iPhone into a professional light meter. Built for film photographers and cinematographers who think in stops, angles, and zones. Point it at a scene and get a live exposure reading, solved across real photographic stop tables. Lock any two of shutter, aperture, and ISO, and the third tracks the light in real time. Tap anywhere in the frame to spot-meter: the tapped area is placed at middle gray, exactly like a spot reading for shadows or skin. • Live scene metering