This copy was professionally modified to work with both the Sony FE 28mm f/2, where it turns the lens into a 21mm, and the Sony RX1 series. On the RX1, RX1R, and RX1R II, it converts the fixed 35mm lens to 24mm, making it a very practical setup for travel.
Here are a few sample images taken with the RX1R II using this adapter, resulting in a 24mm focal length with the conversion lens attached:
Cosmetically, it looks mint. The only exception is the rear mount, which was modified specifically to allow proper fit and use on the RX1 series. Please see images for details.