great part, cheapest Macro function .... :)

I bought the Umkehrring some time ago. I am pleasantly surprised at how well it works .... I use it together with the Canon 18-55mm EFS lens. With a little practice it works quite well, since you can only focus manually through the ring. Penetrate even deeper into the realm of the super macro order I still use spacer rings and a tripod. This achieved a magnification up to 450 times (12Megapixel camera and 19 "monitor).

I can highly recommend the reversal ring if you want to experiment a bit.