Schneider Kreuznach 2x Tele-extender for Phase One and Mamiya Leaf, XF or 645DF. On eBay now starting bid $895.00
https://www.ebay.com/itm/254589041110.
This comes with front and rear caps and original box. This is MINT--no flaws body or glass.
From the B&H website: $1995.00 new. Phase One & Mamiya Schneider Kreuznach Overview
Effectively doubling the reach of select Phase One XF and 645 AF as well as Mamiya Leaf 645 AF-mount lenses, the Schneider Kreuznach 2x Teleconverter is a versatile and compact option for increasing your apparent focal length. Dedicated to the Schneider Kreuznach 240mm f/4.5 and 150mm f/3.5 leaf shutter lenses, as well as the Mamiya Leaf 150mm f/2.8 AF lens, this teleconverter produces extended focal lengths of 480mm and 300mm, respectively. Regardless of the lens in use, this teleconverter requires manual focusing operation and also reduces the effective maximum aperture by two stops.
Compatible with the following lenses:
Schneider Kreuznach 240mm f/4.5 LS AF
Schneider Kreuznach 150mm f/3.5 LS AF
Mamiya Leaf AF 150mm f/2.8 D
Doubling the effective focal length, this teleconverter helps to extend the reach of select lenses for greater detail of distant subjects. Additionally, the teleconverter also helps to generate the distinct image compression a long telephoto lens provides.
Supports manual focus operation only.
2x teleconverter reduces the effective maximum aperture by two stops.
See pictures at
https://www.ebay.com/itm/254589041110
