I got some good news about the upcoming Sony 20-70mm f/4.0 lens. First of all I can now confirm it has constant f/4.0 aperture and that lens will be announced next week on Jan 17. I also have been told the lens is optically superb with very little distortion (good news considering the 20mm at the wide end) and sharpness that beats the performance of the first generation 24-70mm GM.
Rumored Sony 20-70mm f/4.0 specs:
- sharper than the first generation 24-70mm GM
- very little distortion
- Price 1.599 Euro
- Announcement on January 17