They already are there Donald. The Canon EF-S works with the 300D only (not that any 10D-user could miss not being able to use that lens). Thank god it seems Canon gave up their plans of extending that series. sigh By just offering the analog-equivalents they let this problem (of different factors) be solved by the customer. Funny .. even now there are sites online telling us, there is no crop(or multiplying)-factor trying to prove this with images, confusing the people even more. And they are not totally wrong in terms of composing images. Tom :)