While all the SLR and DSLR has their own range of prime lenses, the micro four-third cameras do not until recently. Olympus is one of the first few imaging companies that managed to create a prime lens for its range of micro four-thirds camera and the 75mm f/1.8 prime lens is a good one that you can certainly look at.
The 75mm f/1.8 is a certainly interesting lens and when equipped to a micro four-third camera, you will get a focal length of roughly 150mm due to the crop factor found in all of the cameras. The good thing about this lens is that it will work rather well under low lighting conditions and this is thanks to the wide aperture that Olympus has managed to put inside this lens. As far the elements available inside the lens, there are 10 different elements from 9 different groups and some of these work to reduce chromic aberrations found in certain lenses.
In addition to the 75mm lens, there is also a splash and dust-proof 60mm f/2.8 macro lens. The 75mm is estimated to be released sometime in summer with a price tag of $900. As far as its purpose is concerned, Olympus claims it to be a winner in both movie and still shots.