LEE Filters - Stopper Exposure is the official exposure guide for photographers utilizing LEE Filters' Stopper long exposure camera filters. The app aims to assist users in maximizing the potential of their Big, Little, and Super Stopper filters by accurately determining the necessary exposure and providing a flexible timer for extended shutter speeds.

With a simple menu selection, users can choose between different Stopper options: 6 Stops for Little Stopper, 10 Stops for Big Stopper, and 15 Stops for Super Stopper. The app allows users to adjust their metered shutter speed using the left-hand wheel and view the adjusted exposure on the right-hand wheel, converting a wide range of shutter speeds in 1/3 stop increments.