Orion 20mm M48 Extension Spacer Ring

This aluminum extension ring, or spacer ring, has 48mm (M48 x 0.75) male thread on one end and 48mm (M48 x 0.75) female thread on the other end. It provides 20mm of extension length and can be combined with other M48 extension rings of the same or differing lengths to achieve the spacing required for cameras, coma correctors, or field flatteners. The Orion 20mm M48 Extension Spacer Ring is recommended for use with the Orion 2" Photo-Visual Coma Corrector for Reflectors to provide the 75mm back focus distance needed when using a DSLR camera. Provides 20mm of spacing when needed to achieve proper back focus Has 48mm (M48 x 0.75) male thread on one end and 48mm (M48 x 0.75) female thread on the other end Can be combined with other M48 extension rings of the same or differing lengths Recommended for use with the Orion 2" Photo-Visual Coma Corrector to reach the 75mm back focus distance needed when using a DSLR camera Anodized aluminum construction 20mm M48 Extension Ring