You want to take a lovely photo of the delicate swirls of a seashell. The only problem is…you can’t figure out why your extension tube won’t focus. Macro photography takes you into the beautiful and enticing world of the minuscule. A dewdrop hanging from the end of a calla lily, an insect drinking nectar from a flower, the brilliant sparkle of the diamonds in a wedding ring — these photos are made possible by macro lenses.
But macro lenses are expensive so you may have opted to use an extension tube with a regular lens instead.