Edited sentence: First SDM lenses support both sistems too.Pentax introduced his Supersonic Drive Motor (SDM) in 2006 with Pentax K10D model and two lenses (DA* 16-50/2.8 AL ED [IF] SDM and DA* 50-135/2.8 ED [IF] SDM).Since than all Pentax DSLR support both SDM and the motor inside the body.The first SDM lens that does not support the old focusing sistem was DA 17-70/4 AL [IF] SDM (2008)