ND Filter Timer is a handy app for DSLR photographers who take long exposure shots using Neutral Density filters. It is a simple calculator and timer app that helps photographers select the appropriate shutter speed and filter for their shot. The app allows you to select the shutter speed applicable without the filter and then choose the filter you intend to use. The app will display the shutter speed you will need to use with the filter, and if the time is 4 seconds or longer, the timer will be available.

The app supports shutter speeds ranging fromto 30 seconds at 1/3 stop intervals. It also supports single 1 to 16 F-stop and ND400 filters. Additionally, the app supports timer complete notifications on Android Wear devices. If you encounter any issues or bugs or have any suggestions, you can contact the developer through email.