The adaptor ring is crucial to the LEE Filters system. It screws onto the camera’s lens and, in turn, the filter holder clips onto the adaptor ring.
This adaptor ring has been specifically designed for the Fujifilm GF23mm lens.
The GF 23mm f/4 R LM WR G-Mount Lens from Fujifilm has a 35mm full frame equivalent field of view of 18mm and is perfectly suited for landscape and architectural applications.