From the resulting images I'm still not entirely convinced, because I still lack the last bit of sharpness ... but is perhaps also to me.
Reminder: By reversing ring can no longer focusing on the lens. I have the camera mounted on a sliding plate, this. On a ball head on tripod The focusing takes place then go back and forth on the carriage. The Focus is set using the aperture ring on the lens. Therefore, the lens should also possess such. What with the G lenses not so is the case!
In any case, the reversing ring is the cheapest gateway drug in macro photography and can therefore be recommended without reservation.