i will be doing street/ travel photography. So far i have a kit lens and a 45mm f1.8. I am now thinking of getting a wide lens. Im torn between getting 12mm f2.0 and 9-18mm f4.0. initially i am thinking of getting the wider lens 9-18mm because of the difference in the crop factor. I cant help but disregard the wider aperture though jn the 12mm lens. For the subjects/ theme i have in mind, what should be my priority? Focal length or aperture? Olympus is making it hard for me to decide.