HI folks, does anyone know what camera this shade might be from or what it will possibly work with? The ruler is 6 inches. It has a couple filter holders approximately for 4 inch filters. The lens attachment is removable and has 77mm threads. The useful bellows extension is 6 inches give or take. It appears that it would attach to a front standard or lens board and then attach to a lens with the threaded ring. Does anyone know what camera or system it belongs too? There are no indications of the manufacturer on it. Thanks folks!