A small app for astro photographers for calculation of image filed sizes for certain combinations of camera and lens. You can also calculate the maximal exposure time for shots without guiding and calculate the length of star trails. It has a custom editable camera list. After installation and first execution of this app the list is saved on your SD card under sdcard/.com.strickling/astrocameras.txt. It can be edited with any text editor. Kewords: astrophotography, photography, focal length, lenses, image size, field size, picture size, star photography, astronomy