Movcam 144:87mm Step-Down Ring for Clamp-On MatteBoxes
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The Movcam 144:87mm Step-Down Ring allows you to mount 87mm lenses onto 144mm 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)
|Mount Type||Split, clamp-on|