i am looking for some fast wide lens for my gh2. i do video mostly and do lots of low natural light filming at night. i have the 20mm pancake and a 50mm 1.4 fd. i find myself using the 20mm most of the time do to the focal length. i was looking at the Voigtlander 17.5 but its so $$$$ and doesnt have auto focus which i use when useing a steadi cam or boom. was also considering the 25mm lumix lens and the slr magic 12mm. i can get both for less than the price of the voight. number three the 12mm f2 Olympus but thought it maybe to slow. i have searched extensively on this and all these lens seem to be favorable just want to see who has used them and the first hand experiences to help me decide. also if i have over looked any other options.