Photo Assistent is a free Android app developed by Jens Perkiewicz that offers useful photography-related calculations. This app supports over 300 cameras and provides functions such as depth of field (DOF) calculator, hyperfocal distance calculator, and shutter values calculator for single-shot milkyway photography. It also calculates the shutter speeds for taking pictures out of hand, print sizes for photo-prints and wall-prints, and provides tables and cheat charts for aperture values and other photography-related stuff.

With Photo Assistent, photographers can calculate in meters/centimeters or yards/inches, and the app is perfect for those who want to save time and avoid the hassle of manual calculations. The app is easy to use and provides accurate results, making it a must-have tool for photographers.