The Zuiko Digital 25mm f/2.8 is a Four Thirds System standard-series lens manufactured by Olympus, sold both separately and bundled in a kit with the E-420 camera.

It is a "pancake" lens, a very compact prime lens designed to be easily portable.

When released on the market in 2008, it was one of a very few prime lenses designed explicitly for digital cameras, and the only one targeted at the entry-level consumer market.

[1] It was praised by reviewers for its small size and the sharpness of the images it produced, but at the price of relatively high chromatic aberration and barrel distortion; overall, the image quality was seen as no real improvement over the normal Olympus 14-42mm f/3.5-5.6 kit lens.

[1] Green background indicates lenses with image stabilization.