Does the Panasonic G2 have the "constant preview" feature? I read a review that says it does, but I cannot find it. I suspect this function starts with the GH2. I want to find a way to use the G2 manually with legacy lenses without having the VF2 and LCD screen automatically brighten in dark situations. I think "constant preview" does this. How does one achieve this with the G2 if the feature isn't available? Thanks!