From Manufacturer
Provided packed in a compact hard case, the Swing-Away Wide-Angle Carbon Fiber Matte Box from Camtree has a 15mm LWS rod mount design and a rear opening supporting up to 105mm diameter lenses. It will work with lenses such as the Sigma 18-50mm f/2.8 and Canon EF-S 18-200 but supports up to a 28mm focal length, and it provides a 16:9 format for wide-angle shots. The swing-away bracket is height adjustable up to 0.8" for compatibility with various lenses.
The matte box has one fixed and one 180° rotating filter tray and accepts optional 4x4 filters. The trays can be inserted or removed without having to break your setup down. The matte box hood is made of carbon fiber for a lightweight design, and the top and side flags of aluminum. When you're not shooting, the top flag can be closed to cover and protect your lens.