iOS 5 perhaps?
OSX is the Macintosh operating system.
The Camera Connection Kit works the same in iOS 5 as it did in iOS 4. Your camera and SD card (formatted in the camera) should work fine. It's for importing photos and movies to the Photos app (though it may work with a
few other devices). It supports fewer cameras for movies, so that part may or may not work.
The import works with just about all of the popular point and shoot brands, and most DSLRs. RAW file format is problematic. There are a variety of RAW formats and they don't all behave the same on the iPad. The camera USB cable is also hit or miss. Some cameras draw too much power, even when on.
Here are the two most helpful of Apples support pages on the Camera Connection Kit.
iPad: Using the iPad Camera Connection Kit
iPad: Using iPad Camera Connector with unsupported USB devices