The second generation Lucroit Pro holder is specially designed for large-barrel wide- angle lenses such as the Canon TS-E 17mm or the Nikon 14- 24 that otherwise lack a filter solution. This re-worked holder now comes with tabs for attached French Flag and barn door style visors (included in holder + adaptor kits) for controlling reflections and lens flare. Adapters for this holder system fit over the lens to eliminate vignetting with these extreme wide angle lenses. Lens specific adapters are available for 19 wide angle lenses, plus 8 sizes of threaded adapters.