Number of elements and min. close focus are 2 specs I cannot find.
EDIT: Found it
The 16mm F1.8 is comprised of 15 elements in 12 groups, with 2 aspherical lenses and 3 ED elements. Its aperture has 11 blades, which Sony says should provide smooth, circular bokeh. It can focus on subjects at as close as 0.15m (5.9") away.
