Just upgraded to the 5D mark iii from my trusty old 500D and just getting to grips with it, but on my old 500D I used my efs 18-55mm lens loads but the 5D doesn't take efs lenses so was wondering if anyone can suggest a suitable alternative along the same lines as my 18-55mm efs lens that will fit the 5D and that wont break the bank as funds have taken a pounding buying the 5D, all advice much appreciated!