This 15mm viewfinder adapter can be mounted directly to the original Canon EOS C200 / C500 MKII / C300MKIII top handgrip and allows the use of 15 mm-based viewfinder systems. This adapter is designed to hold a horizontal 15 mm bar, to which a 15 mm NATO rail can be attached, to mount the original Canon EOS C200 / C500 MKII viewfinder or any third-party viewfinder, monitor or recorder. Furthermore, by using this viewfinder adapter, other 15 mm rail accessories, like the mic holder (0350-1460) or cold shoe adapter (0350-1462) can be mounted properly on top of the camera.