Tamron filed another patent 2012-189637 in Japan for a 40mm f/2 lens for mirrorless cameras with 1″ sensor (Nikon 1). The patent contains several different calculations for 30mm, 35mm and 40mm f/2 versions. Few months ago Tamron filed a patent for 35mm f/2, 40mm f/2, 28mm f/2 and 38mm f/2 lenses.
