The Schneider Kreuznach Teleconverter x2 practically doubles the focusing distance on compatible lenses. It is ideal for landscapes and some wildlife photography. 

The teleconverter also helps to generate the distinct image compression a long telephoto lens provides.

The Teleconverter x2 is compatible with:
— Phase One 150mm f2.8 D series Lens (doubles focal length to 300mm)
— Schneider Krueznach 150mm f3.5 (doubles focal length to 300mm)
— Schneider Kreuznach 240mm f4.5 (doubles focal length to 480mm)

Features Auto Aperture and Manual Focus. It reduces the maximum aperture by 2 f-stops.

Note: For larger lenses, as for instance the Schneider Kreuznach 240mmLS or if you are using the Teleconverter x2, Phase One recommends a Tripod Lens rail which will support both the lens and the camera system.