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It is a EF.
Sorry, there was a problem. Please try again later.The feature of EF-S allows the camera to use both EF-S and EF model lenses. My camera came with the 24-105mm F/4 IS lens which is a EF lens. This link might help explain it better. http://photo.stackexchange.com/questions/380/what-is-the-difference-between-ef-and-ef-s-lenses
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