The SW150 Mark II Holder fits to the lens via a lens Adaptor that needs to be purchased separately from the filter holder. Each Adaptor consists of a front ring, a compression ring and a locking ring that have been specifically designed for each particular lens. When fitted, they form a collar that remains on the lens at all times.
We are working on Adaptors for additional ultra-wideangle lenses so check back if your lens isn’t yet listed.