Works very well.

Great seller and fine products. AAA+++

Many reverse lens macro filter adapters (such as those found on eBay) come with M52x.75 threading to screw on to the front of a lens. Reverse filter adapters allow a lens to be mounted backwards on the camera. Using this Rafcamera adapter, that same reverse filter adapter can be used to mount regular lens on a Chinese helicoid. This will turn your helicoid into a bellows and allow focusing beyond the normal range provided by the camera lens. Another tool in your tool box!