DIY Long Exposure Star Tracker ($40, No Electronics)

This video shows you how to build and use a budget barn door tracker for astrophotography with a standard SLR camera. If you’ve ever tried to photograph the night sky, you probably ran into the problem of star trails. Long exposure reveals some great detail in the night sky, but after about 15s the stars become streak. In this video you’ll see what goes into building a very simple star tracker, as well as how to use it. This features images taken with a Sony A7 and 28mm lense, though any DSL with a 50mm o