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UMB-1 Universal Mattebox (Extra Stage Set) allows all versions of the Universal Mattebox to be converted to three stages. Includes individual filter tray catcher, rotation lock, filter lock, and 4×5.65 filter frame. Also accepts 4×4 filter sizes.

Specifications:
Weight: 181.4 g (.5 lbs)
Dimensions: 12.7 x 177.8 x 177.8 mm (0.5 x 7.5 x 7.5 in)

Universal Mattebox Kit Guide