SVBONY SV123 Spotting Scope Camera Adapter+Nikon/Canon Adapter DSLR&SLR Ring | eBay
Amazon.com : SVBONY Full Metal Spotting Scope Camera Adapter with T Ring Adapter for Canon M42 Thread for SV13 65mm and 80mm Spotting Scope Take Photos and Videos : Electronics
ZEISS Camera adaptor Photo adapter T2 for spotting scope e Diascope
Kowa TSN-VA2B Video Camera Adapter with Integrated Eyepieces for TSN-880 & TSN-770 Series