FOViewer Deluxe is a free astronomy app for Android. This tool will help you calculate the magnification of the telescope or eyepiece that you use to see the stars and planets in the night sky.

FOViewer Deluxe can calculate the magnification for any combination of telescope and eyepiece. It is very easy to use, and it has a simple interface. It is very useful for people who want to get a better idea of how much the stars are magnified, and it is also useful for people who want to take pictures of the night sky and calculate the exact size of the stars and planets in the image.