Photography is hardly a cheap hobby to pick up, but even within photography, some branches are more expensive than others. And ranking pretty close to the 'most expensive' side of that line is astrophotography... at least the kind that will yield incredible photos like the one you see here by photographer Mike Hankey.
Getting quality astrophotography shots comes with several challenges, and one of the main ones is that the starts don't stand still -- or, more accurately, we don't. Since the Earth enjoys spinning on its axis once every 24-hours or so, exposures in excess of about 1 second begin producing star trails unless you have the camera or telescope on some sort of tracking mount.
Fortunately, if you don't have the money to purchase a $1,000+ equatorial mount but still want to take long-exposure astrophotography, the DIY barn door tracking mount above will enable you to do so on the (relatively) cheap.