Genuine Canon Extension Tube Set M5, M10, and 2X M20 includes the manual aperture adapter which is required for the bayonet fit canon FD lenses. Not required fir lenses mounted with the silver ring. Included in the package is a genuine Canon 52mm reversing ring. The extension tubes will fit any Canon FD or FL manual focus lenses. The reversing ring is designed for lenses with a 52mm front. Both enable macro photography by moving the lens closer to the subject. The extension tubes and reversing ring allow for increased magnification and closer focusing distance. Included is a printout of the original instructions for the extension tubes.
eBay