Image on top shows the Sigma 135mm f/1.8 DG DN lens construction
Today four new Full Frame lens patents surfaced in Japan:
- Sigma 135mm f/1.8 DG DN
- Tamron 16-70mm f/4.0
- Tamron 20-72mm f/4.0
- Tamron 28-72mm f/4.0
The Sigma would be certainly a nice and cheaper alternative to the Sony 135mm GM. And the 28-75mm f/4.0 would make sense as cheap travelzoom option.