Cavision 40.5 to 49mm Step-Up Ring Canare CA35HSVB02 which allow it to compress

which allow it to compress and grip the lens securely

consider using professional installers to attach this product

16 mV (-50 ~ -30 dBV)

Another benefit of this power solution is that no heat is generated

Cavision 40.5 to 49mm Step-Up Ring Canare CA35HSVB02 which allow it to compressFor Cavision Clamp On Matte Box on Lens Adapts Lens with 49 Filter Thread For 40. 5mm Filters 6mm Depth Anodized Aluminum Construction This Cavision 49 40. 5mm Step Up Ring permits the use of 40. 5mm threaded filters on lenses with 49mm filter threads. Additionally, the 6mm depth of this ring provides enough threads to secure a filter, and is suitable for use with a rod mounted matte box.. The step up ring features a lightweight, aluminum alloy