Olympus Zuiko ™ 50mm f/2.0 ED Lens

A medium-power telephoto macro lens with a focal length equivalent to 100mm on a 35mm film camera. Combines the brightness of an F2 aperture with the compact size of the Four Thirds System. The ability to select bright apertures with fast shutter speed widens the possibilities of photography. The use of an extra-low dispersion (ED) lens delivers superb image quality. Features maximum 0.52x magnification, equivalent to 1:1 on a 35mm film camera.

Defines a near perfect MTF graph for lens quality

Before purchasing this lens you should read some literature. You don't need to be a lens expert - but know what "MTF" means. MTF is modulation transfer function. It is a qualty by which lenses are judged. The more linear the plot, the better the odds you've bought a winner. Olympus and Cannon both publish their MTF plots of their "BETTER" quality lenses. They don't publish the plots of the "included in the box" lenses. For good reason. You can analyze them on a machine if you have a lab and discover they resemble a rollercoaster and not a horizontal line like you would prefer.