Daniel & Jon:


Thanks for the crystal-clear explanation. That's essentially what I thought might be the case.


Quote Originally Posted by Daniel Browning
The reason they do not exist, IMHO, is because most lens makers think the 17-50 range is more useful on APS-C.

I expect that you're correct. The 17-55mm or 18-55mm covers almost the same "framing" range on the APS-C bodies as the ever-popular 28-80 or 28-90mm lenses did on 35mm cameras. When I bought my first Canon SLR, a Rebel 2000, it came with two cheap Sigma lenses, 28-80mm and 70-300mm. (I had been using two Minolta bodies--XD11 and XP470, but they and all my lenses were stolen.) I still have them, as they're hardly worth trying to sell, but that package is still available. I may end up donating/loaning them to a 4-H member. I've already done that with the Sigma 28-300mm lens I bought immediately after I got the 30D with the kit lens (non-IS at the time). Little did I guess, then, that, less than 2 years later, I would have bought 20 more lenses plus two extenders. (I gotta get around to selling the ones that have become redundant.)