Do all Canon DSLRs have autofocus motors? I've searched a lot but found mixed answers. Some sites say that no EOS body has a focus motor (and that all EF lenses have AF motors), but some say all EOS bodies have AF motors. Which is correct?
Answer
No Canon EOS body needs AF motors because every single Canon EF lens released since the EOS system was introduced since 1987 has a focus motor in the lens. Thus no Canon EOS camera has ever had a need for a focus motor in the body.
There are a few manual focus lenses in the EOS system, but they are clearly designated as such by not being named as an EF lens: The MP-E 65mm 1-5X Macro lens is one such example. The TS-E series of tilt & shift lenses are another. Beyond those few rare lenses every EOS lens has AF capability built into the lens. The vast majority of those lenses have Ring type UltraSonic Motors driving the focus mechanisms of those lenses. A few lenses have newer STM motors which are more suited for use capturing video. A few others use micro-USM motors and a few others use plain old geared motors to drive the AF system. But all of them have the AF motor located inside the lens.
Not only do Canon EOS bodies not need a clunky, noisy mechanical interface between the body and lens for autofocus, but they don't need a mechanical linkage prone to adjustment issues left over from the 1950s to control the lens' aperture either. This means that all communication between a Canon EOS body and a Canon EOS lens is communicated electronically.
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