Hasselblad today officially announced the previously rumored the XCD 21mm f/4 medium format mirrorless lens for X1D – Hasselblad’s Widest Lens Ever: the XCD 21mm has an extremely short focal length that provides a 17mm full frame equivalent lens, making it perfect for landscape and architecture photography. It features a 32 cm close distance setting (1:10 image scale) and an aperture range between 4 and 32.
As part of the X System lens range, its lightweight and compact size perfectly complements the compact X1D body. Like the other XCD lenses, the XCD 21mm lens has an integral central shutter offering a wide range of shutter speeds and full flash synchronisation up to 1/2000th second.
You can read more at Hasselblad.