For all those avid iPhone photographers out there–or for those spies on a budget–this ridiculous iPhone zoom lens is a must-have. These can generally be found on eBay (or from one of many Chinese retailers), but here’s the basic idea:

The 5 centimeter lens attaches to the phone by way of an included case. The lens slides overtop the iPhone camera, magnifying your pictures without sacrificing picture quality. Aside from minor vignetting, the pictures are perfect. Here are a few before and afters, courtesy of Flickr user Sam Cornwell:

The lens isn’t what any normal person would call practical but, being so small and cheap, it’s worth it to have lying around in case a spy-type mood happens upon you.