Hi, half my post was cut off, i have a 24 mm, a 50 mm and two kit lenses, 17-55 and the 75-300, i'm looking to buy a 18-135, will this be a good interim lens to save me changing lenses between my two kit lenses. Im prepared to spend up to £400-500 if necessary for the right lens as i don't want to buy a lens that wont overly expand my range. I photograph motor sports, portraits, landscapes and street. One of my friends used a 17-55 f2.8 on a week end trip and i don't remember him actually changing lenses all week-end. But its the correlation between a 17-55 and my 75-300, you would think the 75-300 would be a much better lens.......the numbering confuses me !