Thanks guys so it seems that you guys suggested me to add a wide angle len for my every day use first then buy a telephoto len later. In that case i want to know which lens you guys more often use between 10-22 and 70-200? and Do you have any other wide angle lens to suggest me because the canon 10-22 is an EFS only, i may upgrade my Canon 50d to a full-frame next year though.