What the advantages of having a full frame sensor, other than the obvious basic fact that you dont have to take the cropping into account? Is there more to it than that? I do no digital whatsoever, I'm still all film, so I dont really know. I was looking at the Xti, versus whatever the cheapest full frame model is, and it was more than twice as much. So my basic question is are there significant advantages that make it worth the extra cost considering it will mean extra months of saving for me?