Canon EF 28–105mm ƒ3.5–4.5 USM

Review
This is the best Canon's consumer lens that I would say, given its price. The lens covers from 28mm, wide enough for landscape photography and the 105 range for portraiture. Hence, it is a lens to carry around if you want to travel light. Even though the quality of the lens is not so optimal but it has its own merits. You can refer to the table on the MTF in the Photodo website for more details.