I'm thinking about getting a zoom lens to pair up with my 18-55 for outdoor portraiture. How does the 55-250 compare to the 18-55 image quality wise? (I'm satisfied with the image quality of the 18-55). I already have the 85 1.8 for general portraiture but sometimes I need the zoom of a long focal range to get different perspectives (such as zooming down from a set of steps or other obstacles not to mention at 250mm F5.6 you will have a good amount of background blur as well) or different distance perspectives. I'm not expecting L quality image quality or build for but for $200 or less a lens that can do straight F5.6 from 55-250 (400mm on crop body) is pretty darn good.