The WDS-611 is a complete rear frame, with SLW-80 insert/digital back interface, to accomodate a digital back with Hasselblad V interface to the WDS-body working with the WDS/WRS Lenspanels with Digital Series Lenses. Digital Backs with Hasselblad-V mounts can normally be mounted in landscape and portrait mode themselves. 

The rear frame has the SLW-80 digital back interface plate for Hasselblad V that can also be switched between landscape and portrait mode.

The SLW-80 digital back interface is compatible with the WRS series, Actus DB, Actus-XL-DB and more.