Here are a few more lens rings for R1 and R10. Lens rings for Sigma 4.5mm, Sigma 10mm, Sunex 5.6mm, Tokina 10-17mm. The Sunex and Tokina version will work for both Canon and Nikon mounts.
Sigma 4.5mm for Canon
Sigma 4.5mm for Nikon
Sigma 10mm For Canon
Sigma 10mm For Nikon
.......coming next week
Sunex 5.6mm for both Canon and Nikon
Tokina 10-17mm for both Canon and Nikon
These lens rings are immediately available. Some are in store already. Others will hit store in a few days.