LEE Stopper is a useful app for photographers and photo enthusiasts to help them get the most from their cameras. It's designed to help you get the most from your Big, Little, and Super Stopper filters - accurately calculating the precise exposure you require and offering a flexible timer for very long shutter speeds.

To achieve the best results, you need to make sure you're using the correct filters. To do this, simply tap the menu at the top of the app, select your filter, and tap the shutter speed you wish to use.

Once you've chosen a shutter speed, tap the right-hand wheel to set the exposure time. If you're using the Big, Little, or Super Stopper filters, you can also turn the left-hand wheel to set your desired exposure time.

The app is very simple to use and is designed to be user-friendly. There is a handy user guide and links to a variety of helpful and inspiring web resources to support your photography.