For this system to work, you need a Pope Shield magnetic ring (depending on the size of the filter thread on the lens). You can find it in the Magnetic Rings section.
If you want to use Raynox – by inserting between the Magnetic Diffuser and the Magnetic Ring, then don’t forget the delimiting magnets (3x magnet). You can find it in the Magnetic Rings section.
Magnetic diffuser sizes:
• “A” 46mm-55mm – the possibility of purchasing magnetic mounting rings with sizes 46mm, 49mm, 52mm and 55mm. 
•“B” 58mm-67mm – the possibility of purchasing magnetic mounting rings with sizes 58mm, 60mm, 62mm and 67mm. 
•”C” 67mm-82mm – the possibility of purchasing magnetic mounting rings with sizes 67mm, 72mm, 77mm and 82mm. 
This way you can use one Pope Shield diffuser on multiple lenses.