I know several Olympus users who have been toying with purchasing the Olympus M. Zuiko Digital ED 7-14mm f/2.8 Pro for ages but they have been put off by the need to use an adapter and specific filters. The M. Zuiko Digital ED 8-25mm f/4 Pro is the perfect solution.
Solid construction and weatherproof build, Accepts screw-in filters, Manual focus clutch
The lens needs to be extended manually before use, It's best to avoid the smallest aperture setting, Quite large for the format