I am getting back into photography and going digital. I am looking into the Canon Rebel Xti. I noticed they have an FD lens adapter which I have seen on ebay. My question is, has anyone used these and if so, do you lose any quality or features aside from the autofocus. I have some old FD lenses that are in great shape and I would like to try to make these work so any info would be greatly appreciated. Thanks in advance.