[M_Six]

Canon just came out with a new version of the 55-250mm called the STM. It's much sharper than the previous version and considerably sharper at 200mm and above than the 18-200. But there again, you'll need to carry two lenses if you want wide angle and tele. If you stay with photography for any length of time you'll come across this trade-off over and over. The "Do All" walk-around lenses come with compromises, but they are convenient.