EF lenses can be used on any Canon EOS camera (film or digital) where as EF-S lenses only work on DSLRs with the APS-C size sensor (1.6x crop cameras). Thread size is effected by the size of the front element and only matters if you want to use filters. As for the 28 f2.8, it's a nice little lens and is nice for portraits on a crop camera.
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