The EX-25 is a piece that goes between the camera body and the lens that permits you to take macro-like photos with an ordinary lens.  It has the advantage over a true macro lens of being way less expensive, so I can goof around with this style of photography without investing a lot of money.  Many of the reviews noted that you’ll probably want to use a tripod, and they appear to be correct.  But, having just taken the device out of the box and put it on my camera, attaching the camera to a tripod would have required far more patience than I have.  And a slightly greater depth of field would have brought more of the nostril into focus.  I have a lot to learn — but this is going to be fun!