EF and EF-S are only mount designations. As in the way it attaches to the camera body. It's not a measure of quality, even though most EF lenses are better and more expensive, but that's because they're made for the pro grade full frame cameras. EF-S lenses are made for any crop sensor Canon (APS-C). These cameras also have the ability to take EF lenses. Any of the full frame cameras can only take EF lenses. The 10-22mm is an EF-S and it's awesome IMO. Mick, if you buy any of the XXXD or XXD cameras in a kit then you will get EF-S lenses. It's not a bad thing. It just means they're not top shelf items, but you're not looking for top shelf anyway. They'll meet your needs perfectly.