Last weekend I have been testing the 21mm GW-2 wide lens converter in combination with the GV-1 optical viewfinder. And I was surprised what a great job it did. The quality of the glass is really good.
The one thing I did noticed is that when I used the GW-2 lens and set the camera to infinity focus with an aperture of f/5.0 that the images had actually very soft background. It was sharp between 1 and 8 meters, but beyond that started to loose sharpness. So probably it is better to use the autofocus for some landscape work.
All photographs by Wouter Brandsma