Tim Øsleby wrote:
> The entry level bodies from Nikon and Canon are USM enabled aren't they? So
> I have trouble understanding this, "K100D and K110D are entry level so we
> can't expect them to be USM enabled", logic. It does not make sense to me. 
> 
> Most likely this generation Pentax entry level are not USM enabled, but I do
> expect next generation of Pentax to have the needed features. (Presuming
> that USM is the strategy Pentax are choosing to make AF performance better).
> 
> 
> Tim
> Mostly harmless (just plain Norwegian)
>  

All Canon EF mount bodies except the extremely rare EF-M MF body support 
USM, as they all use in-lens AF motors and USM motors are just a couple 
of variants of that (Canon has at least 3 different types of USM 
implementations).

All Nikon digitals support AF-S/AF-I lenses (Nikon's USM[AF-S] and 
in-lens motor[AF-I] names). For the film bodies, it's more complicated, 
but none of the base model AF bodies (F55/50, F401's) support it.

-Adam


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