Male thread and female thread both are M48*0.75mm; Solving spacing problems in astrophotography and eliminates a range of focusing problems
High quality;Fully metal construction and anodizing aluminium process; durable for long time use
Meet different needs;The required spacing can be achieved by combining several extenders of differing lengths; You can use 1 piece; 2 pieces ; 3 pieces or 4 pieces of the extension rings as you like
SV119 extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners