To find fingerprints in my house…..
Was extremely bored the other day so I dusted off the 50mm and stuck 36mm worth of Kenko extension tube between it and the body.  Went on a circular tour of the house randomly snapping anything I could focus on.

The great thing about the Macro shots is that they show up every single speck of dirt, grease or crumb of chocolate.  Shortly after I took this, I cleaned the light switch.