I'm new to photography and have a gx1 with pana 14mm and 14-45mm. I'm not sure if it's my GAS that makes me want a portrait lens. I'm interested in Oly 45 f1.8, but the problem is that it doesn't have IS built in. In low light condition, is this a big problem? Dear GX1 users, what lens do you use as portrait lens? Two more questions: How big the aperture should be to get blurry background? How long the focal length is to avoid face distortion?