Those are SDM lenses. The focusing in the lens is supposed to be better than the motor in the body. I largely use manual Pentax lenses, so I haven't tried them. http://en.wikipedia.org/wiki/Pentax_(lens)#Supersonic_Drive_Motor_.28SDM.29 Andrew On Tue, October 14, 2014 3:09 pm, PhotoRoy6@xxxxxxx wrote: > Pentax K-II cameras has it lens focusing motor in the camera body. > However > some Pentax lenses have motors in the lens . Why? Roy
