I going to buy a new lens(Canon EF-S 17-85MM F/4-5.6 IS USM) for landscaping. My camera is CANON Rebel XTi and my friend told me the lens (18-55mm) which came with my camera should be enough for landscaping and no big difference with the one I want to buy. It is my photographying skills make difference. Do you agree or you have a better suggestion? thanks! my email: jjjjoan@hotmail.com