Tamron working on a fullframe 20mm F2 lens that will also feature optical image stabilization.
Description, self-interpretation of the patent literature
Patent Publication No. 2016-126279
Published 2016.7.11
Filing date 2015.1.8
Example
f = 20.60
FNo. = 2.05
ω = 46.81
Ym = 21.633
BF 38.2971 – 38.3188
Tamron patent
Negative ShiboTadashi
Rear focus
Anti-vibration (a part of the first group)
Take a look at more Tamron Patents
If fit on a Sony a6000, I’d be really interested