There is 'generally' an option on you're camera for "macro" shots. It will look like a flower, selec tthat. Then it will let you auto focus on the object from a much closer distance, just make sure you have a very steady hand, or tripod and lots of light.
What kind of camera are you using, maybe we can help out?
Canon 5DIII | 35L | 16-35L II | 24-70L II| 85L II 1.2 | 70-200 2.8L IS II | 600EX |