 Like the full-featured KAF2 mount, this has power contacts for the lens and supports power zoom and MTF information transferred from the lens to the body, but lacks the mechanical stop-down coupler necessary for full compatibility with the oldest Pentax K-mount lenses.The K10D is typically sold in a bundle with Pentax's SMC-DA 18-55mm kit lens, which has received very favorable reviews compared to kit lenses from Canon and Nikon, because of its build-quality and quick-shift focus system.In addition, the K10D supports in-lens ultrasonic focusing motors, branded SDM by Pentax.