It looks like Tamron is rapidly developing mirrorless lenses. The first list of new lenses coming was leaked here and now we have 4 more. If you look below you will notice there are two 105mm f/2.8, which is probably an indication that Tamron is making some lenses with tweaked designs to take advantage of different mirrorless mounts. Up until recently, most mirrorless lenses have been designed first for Sony E-Mount and repurposed for other camera mounts, but now there are mirrorless cameras with shorter flange distances that might need tweaks to get optimal results.
50 mm f/2.8 Specification and lens arrangement of embodiment 1
Focal length: 49.9833 mm
F number: 2.6093
Half angle of view: 23.1943
Image height: 21.64 mm
80 mm f/2.8 Specification and lens arrangement of embodiment 2
Focal length: 78.8596 mm
F number: 2.8545
Half angle of view: 15.1335
Image height: 21.64 mm
105 mm f/2.8 Specification and lens arrangement of embodiment 3
Focal length: 104.9887 mm
F number: 2.8961
Half angle of view: 11.4568
Image height: 21.64 mm
35 mm f/1.8 Specification and lens arrangement of embodiment 4
Focal length: 36.0396 mm
F number: 1.8823
Half angle of view: 30.7315
Image height: 21.64 mm
105 mm f/2.8 Specification and lens arrangement of embodiment 5
Focal length: 105.0016 mm
F number: 2.8622
Half angle of view: 11.5959
Image height: 21.64 mm
