This is some information I received today from Zeiss regarding a new 18mm Lens for the Nikon F and Pentax K mounts.
There is a bit more into on my website....Rob
Carl Zeiss expands its range of SLR lenses with the addi-
tion of the Distagon T* 3.5/18 super wide angle lens. With
an impressive field of view of 99°, this new, rectilinear lens
provides dramatic perspectives for architectural, landscape
and close-range photography for photographers utilizing
full-frame DSLRs or film-based cameras. The Distagon T*
3.5/18 is a derivative of the ZEISS designs for the Contax
RTS series of cameras, but utilizing all modern materials
and eco-friendly glass materials.
The Distagon T* 3.5/18 ZF for F-mount cameras is sched-
uled for delivery beginning September 2008 and the
Distagon T* 3.5/18 ZK for K-mount cameras will be avail-
able during the third quarter.