I currently have a stock Pentax 18-55mm kit lens. I need a multipurpose lens to replace it, but a slightly wider angle and better zoom is required. I was looking at the Pentax 18-250mm F/3.5-6.3, but I was wondering if there was anything out there with a slightly wider angle. Primary usage: Taking pictures of structures (homes, garages, sheds) which I normally take at 18mm (but would prefer something slightly wider), and also I need the ability to zoom in on things like bad roofs. I would say that about 10% of the houses I stop at have poor roofs which require photos. Standing at the road zoomed in to 55mm doesn't get great shots of the roof. Thanks!