The UMB-1 Universal Matte Box Cloth Donut for Non-Standard Lens from Wooden Camera snaps into your matte box with a 143mm rear opening and is usable with lenses with an outer diameter from 72 to 138mm. It features black cloth with a drawstring forming four thumbloops for adjustment. The cloth fits around your lens, and the thumb loops are used to expand the fabric around your lens. The cloth fits snugly around your lens to prevent light from reflecting off the back of your filters and degrading your image.
The donut is suitable for use with primes and zooms, and it can speed lens changes as you don't have to worry about finding the specific donut for each of your lenses. Additionally, when using lenses with either focus or zoom travel, the universal donut will expand and contract with the movement of the lens, ensuring a light-tight fit.
