I came to know of this unconventional method from my photographer-daughter and tried a few shots some time ago. I had to hold the lens in place with the hand as it cannot be fixed in the reverse direction. I think I had used the basic 18-55 lens. It is a tricky affair to get proper shots. Here are a few I took. Names are on the photos themselves. I was amazed to see the details it brought out. I later learnt that it is a fancy technique for which even separate rings and fixtures are available!