The VPA 2 must be fixed to the binoculars or spotting scope with a corresponding clamp adapter. The matching clamp adapters for binoculars or spotting scopes are available separately:
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CA-Bs clamp adapter for CL binoculars
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CA-B clamp adapter for binoculars/BTX
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CA-S clamp adapter for ATX/STX, ATC/STC, ATS/STS, STR