Standard Focal Length. With a focal length equivalent to 43.5mm after sensor-crop factor, the 55mm f/2.8 serves as a great general-purpose lens. It offers excellent image quality, and its fast f/2.8 aperture allows fine depth of field control.

Supersonic Drive Motor Autofocus System. The quiet SDM autofocus system provides fast and accurate autofocus operation. It also features Pentax’s Quick-Shift autofocus system for shifting from auto to manual focus for on-the-fly focus accuracy.

High-Quality Build. The fully weather-sealed lens construction works with the 645D or 645Z’s weather-sealed body for maximum reliability in the field.