Sigma digital format lens

First off, hello to all and merry christmas. I was about to order a cannon ef 70-200mm f/2.8L IS Zoom Telephoto usm autofocus lens from expresscameras.com for my sisters Canon EOS rebel XTi 400D when the salesman told me about a new lens made by Sigma. It is a 70-300mm f/4.0 that is "digitaly formated". According to "Tim" there was no image conversion factor. Tim also stated that this tecnology was so new that I would not be able to research it. Can anyone tell me anything about this lens? The price quoted me was $1,299 w/image stabiliser and some other stuff thrown in

Thank you in advance
Joe

The Sigma tecnology is called DC for digital

sigma came out with a line of new lenses designated as DG and DC. Both were exclusively made for dslr's. I have a EF 70-200L and it's a great lens - top of the line for canon. I suggest, if you are looking for a professional lens by sigma, you may try the Sigma EX line of lenses. You can easily identify it. it has a gold rim on it.