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Matte black metal reduction ring for 143mm to 136mm mattebox adaptation

Wooden Camera, Inc.

Wooden Camera UMB-1 143-136mm mattebox reduction ring

SKU CH-3XTE-P1EHN

Reduction ring adapts 143mm matte box to 136mm lenses for secure, wobble-free mounting

  • Adapts UMB-1 mattebox to 136mm lenses
  • Secure wobble-free connection at 136mm diameter
  • Durable construction withstands professional filming use
  • Quick attach and detach for fast lens changes
  • Converts Base or Swing Away to Clamp On configuration

Lens compatibility bridge

This reduction ring converts a 143mm Wooden Camera UMB-1 Universal Mattebox to accept 136mm lenses, expanding the accessory range for cinematographers who need to adapt existing matte boxes to different lens diameters. The clamp-on design allows quick attachment and removal during production without tools. Professional camera operators gain flexibility when switching between lenses on set.

Ideal for UMB-1 owners needing 136mm fit

Filmmakers using a Universal Mattebox with 143mm front diameter who work with 136mm lenses will find this ring essential for secure, wobble-free mounting. It is not suited for shooters whose matte box has a different front diameter or who require step-up adaptation to larger lenses. Teams without a UMB-1 system gain no benefit from this specific reduction ring.

143mm to 136mm step-down conversion

The single specification that determines fit is the 143mm to 136mm reduction, matching the UMB-1 matte box front diameter to the lens barrel diameter. If your matte box front measures 143mm and your lens front measures 136mm, this ring provides the precise connection. Any other diameter combination requires a different adapter.

Highlights

  • Adapts UMB-1 mattebox to 136mm lenses
  • Secure wobble-free connection at 136mm diameter
  • Durable construction withstands professional filming use
  • Quick attach and detach for fast lens changes
  • Converts Base or Swing Away to Clamp On configuration

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the 143-136mm reduction ring on my UMB-1 matte box, and what step do people often miss?

Slide the ring onto the matte box's 143mm front until it seats fully, then tighten the clamp screw firmly; the step often missed is confirming the clamp is fully locked before mounting a 136mm lens.

What maintenance or replacement will the UMB-1 reduction ring need after extended use?

Inspect the clamp mechanism and interior surfaces periodically for wear or debris; replace the ring if the clamp no longer holds a 136mm lens securely or if the mating surfaces show damage.

What is the first limit that appears when using the 143-136mm reduction ring continuously on set?

The clamp's gripping force on the 136mm lens barrel is the limiting factor; vibration or repeated lens changes can loosen the connection, requiring re-tightening during long shoots.

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