Here's a sample taken with my Olympus OM-system Zuiko MC Macro 38mm f/3.5. It is one of the original lenses that were part of the extensive OM-system's macro accessory collection. There's a picture of the lens mounted on my G1 in the Adapted Lenses Forum. The image below was of a rather small orchid and is at about 2x magnification subject-to-sensor. It was taken using a 30mm extension tube in addition to the mount adapters.