The canon 300D and 10D will autofocus with lenses with a maximum aperture of f/5.6 or larger. That covers nearly all lenses except some long telephotos.
Adding a tleeconverter between the camera and a moderately long but slow telephot can also result in a max. aperture smaller than f/5.6, e.g. Canon 28-200mm f/3.5-5.6 lens @ 200mm (f/5.6 max aperture) plus 1.4x teleconverter = f/8 maximum aperture.
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