George Lepp featured this app in his article in the latest issue of Outdoor Photographer. It essentially functions the same (plus more) as the TC80N3 controller...remote release, intervalometer. It also includes motion sensor, sound sensor, magnetic sensor, etc. It's $9.99 but you have to also purchase the dongle and camera adapters at $9.99 each. However, most of the apps will also work with the iPhone camera without needing adapters. TC80N3 is very pricey and I've misplaced mine but I always have my phone with me. Highly recommended.