The app converts a full range of shutter speeds in 1/3 stop increments. Use the built-in countdown timer for any exposure over 5 seconds and see in a glance how long you have left. For very long exposures you’ll also get a reminder notification plus all countdowns finish with an alarm and a timestamp. There’s also a handy User Guide and links to a variety of informative and inspirational web resources to support your Stopper photography.