Contax G1 silver label conversion to green label
Upgrade your Contax G1 to support the 21mm and 35mm lenses
Contax G1 cameras come in two versions: silver label (also called sometimes “white labels”) and green label. The white label version s the original one, while the green one was introduced a couple of years later to support the new lenses: the 21mm and the 35mm.
For a while, it was possible to send the first version to the factory or a repairer to get the camera updated. Now, it seems no one offers this service anymore.