Yes, using this on a cropped sensor will effectively give you around a 400mm stretch. I use it on a 50D and the images are stunning. The inbuilt IS is a real help as well as it means you can handhold at longer focal lengths and not rely on a tripod. Lens is built very well but beware it does extend on zoom, it's not like usual Canon L zoom lenses that are all in one so to speak. I have had mine for around a year now and it's really worth spending the money on it.