The B-Grip is my best friend, the only one I trust to hang to the camera when I am not using it.
Most satisfied with my purchases.
A Reversing Ring allows the photographer to fit a lens onto their camera reversed. It can be used to turn a lens into macro lens.
Reverse Adaptor - Macro Coupler
A range of adaptors that allow a lens to be fitted, reversed, to the the filter thread of an existing lens to produce a two lens macro combination.