Sonyalpharumors.com is reporting that Voightlander will release two “Ultron” lenses in their “M” mount that will work with the Sony a7 platform using an adapter, and which have been optimized for the Sony sensor.
According to SAR, “…the new Voigtländer 15mm f/4.5 Heliar III has been designed with the Sony FE cameras in mind. It means the light hits the Sony FF sensor in a more “favorable” way. And this should bring a considerable improvement on the corners.”
The 15mm is scheduled to ship in April from Fotomundus Germany while a 35mm f/1.7 lens will ship in May.