These magnetic rings have a male & female M67 thread.
Mount it on your housing and on your lens - and snapping the lens on and off underwater is going to be a walk in the park.
Has a safety hatch so the port cannot be taken off by accident.
Nitescuba
FuXin Bulding, HouTing - Bao’An
B623 Shenzhen
China
www.nitescuba.com