With this adapter the ALEXA Studio Optical Viewfinder OVF-1 can accept the ARRICAM Studio Eyepiece (K2.54003.0), ARRICAM Studio Medium Extension (K2.54005.0), ARRICAM Studio Zoom Extension (K2.54004.0) and ARRICAM Studio Anamorphic Extension (K2.54018.0, which is recommended, sadly but ironically, only for spherical viewing with ALEXA Studio).