new to mft and topside photography/videography in general (shoot more u/w photos/vids). i just bought an epm1 with an underwater housing (the housing for the epl5 was too expensive). im looking to complement my kit and 25mm oly prime with a wide angle. i was looking at the 9-18 oly originally but the small aperture could be an issue for me since i intend to use it for low light video and photos (underwater, indoor, night, stage/event). my choice then would be the oly 12mm f2 although i was looking for something a little wider and a little cheaper since weatherproofing is not necessarily important to me. so my question is, (1) are there w-a low light native lenses that will be offered by q2 2015? (2) would i be better off just getting a used oly 12mm/2.0 for 500 usd ( 1 1/2 years old) adn is that a decent deal? (3) are there any other low light w-a lenses that one would recommend aside from the oly 12 that gives good sharpness at widest aperture, auto focus not a requirement but would be a plus.