INON S-MRS Magnet Ring C8-15 Set

A set of "S-MRS Magnet Ring" and "Magnet Ring Adapter C8-15". Attaching on the Canon "EF8-15mm F4L Fisheye USM" lens enables zoom operation. Only "MRS EXT. Ring 33" and "MRS EXT. Ring 111" are usable. Other MRS ports are not compatible.