The upcoming Nikon PC-E 19mm f/4D Tilt-Shift lens is rumored to be announced at Photokina 2016 in September. Here is another lens patent for NIKKOR PC-E 19mm f/4D Tilt-Shift lens.
Patent Publication No. 2016-136212
Published 2016.7.28
Filing date 2015.1.23
Example 1
f = 19.569
FNO = 4.1
ω = 59.317
Y = 21.6
TL = 177.952
Bf = 56.400
via: EG