Formatt Hitech Adapter Ring for 4x4" Filter Holder - 58mm for Wide Angle Lenses
Formatt Hitech Adapter Ring for 4x4" Filter Holder - 58mm - for Wide Angle Lenses - MPN: HT100WAA58
This adapter ring fits the Hitech System 100 filter holders and also the older 94mm filter holders. This adapter ring places the filter holder somewhat closer to the lens than the standard adapter ring. This is necessary for certain wide angle lenses to avoid vignetting.