SWAROVSKI OPTIK AR-S VPA Adapter Ring for Digiscoping and ATS or STS Spotting ScopesThe Swarovski Optik ARS VPA Adapter Ring is designed for use with the Digiscoping VPA Variable Phone Adapter. The adapter ring can be easily screwed onto the VPA and can be mounted onto your ATS STS, ATM STM, or STR spotting scopes. The ring push fits onto the optic's eyecups and optically centers your phone's camera lens in the eyepiece. This is the eyecup ring only, the VPA smartphone adapter is required for proper use.