Fotodiox 49Mm - 52Mm, 49-52Mm Macro Close-Up Reverse Ring, Anodized Black Metal Ring, For Nikon, Canon, Sony, Olympus, Pentax, P

Reverse Ring Allows You To Mount Two Lens Front To Front Via Filter Thread For Extreme Macro Close-Up Photography. Reversing The Lens Greatly Increases The Macro Reproduction Capabilities