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EF means Electro Focus. It is the name of the mount that EOS cameras use.
All lenses for EOS cameras (film, or digital) are EF. EF-S lenses are for digital cameras with APS-C sensors.
EF lenses work on film, full frame digital and APS-C digital cameras. EF-S lenses work on APS-C digital cameras only.
pdlouche
thanks for the advice. how can I tell if the IS works? why would it not be working?
and I have no idea what this means!
Also, if you don't know, the EF system is for full frame as well as APSc