The Movcam 104:95mm Step-Down Ring for Clamp-On MatteBoxes lets you mount 95mm lenses onto 104mm clamp-on matteboxes -- the kinds without a thread on their rear adapter.
The ring is split along a point of its diameter to flexibly widen and mount a mattebox. (A locking pin on the side of the mattebox securely tightens the ring in place.)
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