Step-up adapter rings

Product Name:Step-up adapter rings
The inner ring that screws onto the converter lens,then the outer ring fits into the standard lens.
Adapter ring technology is a local area . It uses a special three-byte frame called a token that travels around the adapter ring.  Adapter ring frames travel completely around the loop.Stations on a  adapter ring  are logically organized in a adapter ring topology with data being transmitted sequentially from one adapter ring station to the next with a control  circulating around the adapter ring controlling access.
Step-Up Adapter Ring allows you to use larger size filters on lenses with a smaller diameter thread. The first number is the size that screws into the lens, the second number is the filter size.