I know film cameras. I dont know digitals very well. All I want is a point and shoot digital, 2MP is fine for my needs. But I need to show interior rooms of houses so what would be digital terms for a 28mm lens? When ebaying wide angle digitals nothing cheap comes up. For example is 3.0mm common ? or 3.2mm ? My searches are not working. My 5.1mm is too narrow.