Feature●Effect: 0.7X●Suitable for: Directors Viewfinder with ½37mm or ½52mm filter thread (or lower with appropriate adapter ring)●Zooming: Fixed focal●Aperture: No light loss●Front Filter thread: ½52mm●Back thread: 37mm with adapter ring; ½52mm without adapter ring●Construction: Single elementDescription Provides a 30% wider angle of view Very compact and light-weight Can be attached to any Cavision Micro directors finder with 37mm front thread (e.g. VFTW-11x, VDM-11x etc.) or to11x Large Rotating Directors Viewfinder (VFRW-11x) when AR52-37D6 adapter ring is remove