i guess one day the 350D will be discontinued... haven't heard anything in that direction till now... and i guess it's not a big issue... eventually there won't be a successor for the 350D but would that be an issue ?!? you'll always be able to use your objectives with most other DSLR's from Canon (except they have full size sensors - in this case you can just use the "regular" objectives - not the ES (right?) series... sigma lenses are compatible with the canons if they have the canon mount... :) half of my objectives are sigma...