The Swarovski VPA AR-B adapter ring was specifically designed for the VPA Variable Phone Adapter. It is the accessory you will need for digiscoping. You can easily screw this adapter ring on your VPA. The ring will fit on the eyecups of the binoculars or telescope and centers the camera lens of your phone in the ocular.
The AR-B adapter ring was developed for use with Swarovski Optic binocular systems. The adapter allows you to easily connect your CL Companion, EL, EL Range or SLC binoculars to your smartphone.
You need this adapter ring when using the Swarovski VPA Variable Phone Adapter.