While the EF 40mm f2.8 STM may be tiny in stature, it has some big things to offer. With its relatively wide aperture and useful focal length, this amazingly compact camera lens or pancake lens is the perfect addition to any kit. Its focal length makes it a great general purpose lens one that you can keep in your pocket, or leave mounted on your camera ready for action. Despite its small size, it's still solidly built, with a standard metal mount and a body constructed of engineering plastic. You can also expect good things in terms of image quality. Its wide f/2.8 aperture makes it easily handholdable in low light conditions, and perfect for stopping motion outdoors making it a handy outdoor sports photography lens. The STM in its name refers to its Stepping Motor driven autofocus, which allows you to focus quickly and accurately. Using this lens, you will be able to create images with excellent image sharpness, beautifully smooth bokeh, and very well controlled chromatic aberration, distortion and flare.