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Split metal ring, 130mm outer to 100mm inner, side locking pin

Movcam

Movcam 130mm to 100mm Step-Down Ring for Clamp-On Matte Boxes

SKU CH-3N9Z-DRGDM

Adapts 130 mm clamp-on matte boxes to accept 100 mm lenses with a secure, split-ring design and locking pin

  • Adapts 130mm lenses to 100mm clamp-on matte boxes for broader compatibility
  • Secure locking pin prevents wobble and keeps the ring firmly in place during filming
  • Split-ring design flexes to widen and mount the matte box securely
  • Durable construction withstands rigorous professional use for long-lasting reliability
  • Lightweight build adds minimal weight to maintain balance on handheld setups

Universal 130 to 100 mm Step-Down Ring

The Movcam step-down ring lets cinematographers attach 100 mm clamp-on matte boxes to lenses with a 130 mm front diameter. It is built for professionals and serious hobbyists who need to mix filter systems without buying new matte boxes. The aluminium construction keeps the accessory light while resisting wear on set.

Tool-Free Split Design With Locking Pin

The ring splits along its diameter so it can flex over the lens barrel and then lock in place with the matte box’s own pin. No screws or adapters are required, but the latch must engage fully or the box can rotate during a take. Dirt in the split gap is the most common cause of a loose fit.

Handles Standard 130 mm Fronts, Not Larger Diameters

The ring comfortably secures any lens measuring 130 mm at the front, giving full access to 100 mm filter trays and shade blades. Lenses wider than 130 mm cannot be accommodated, and threaded matte boxes that lack the clamp-on pin will not lock to this ring.

Highlights

  • Adapts 130mm lenses to 100mm clamp-on matte boxes for broader compatibility
  • Secure locking pin prevents wobble and keeps the ring firmly in place during filming
  • Split-ring design flexes to widen and mount the matte box securely
  • Durable construction withstands rigorous professional use for long-lasting reliability
  • Lightweight build adds minimal weight to maintain balance on handheld setups

Specifications

No published specifications for this item yet.

Questions about this item

How can I confirm the step-down ring is seated correctly on my 130mm clamp-on matte box?

The split-ring design flexes to widen, then the locking pin on the matte box engages to hold the ring firmly; a secure, wobble-free fit with no play indicates it is working as intended.

What comes in the box and do I need any extra parts to mount a 100mm lens?

The package contains the 130:100 mm step-down ring only; the 100mm lens and the 130mm clamp-on matte box are separate items you must already own or purchase.

Which version of the ring should I choose for a 130mm matte box and a 100mm lens?

This single model is made specifically to adapt 130mm clamp-on matte boxes to 100mm lenses, so it is the correct choice for that combination.

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