Ujjdwiurgh M42 Extension Tube Kit 3/5/7/10/12/15/20/30mm M42X0.75 for Astronomy Professional Telescope Astrophotography

The extension tube has a T2 interior thread and a T2 exterior thread for solving spacing problems in astrophotography and eliminates a range of focusing problems. The required spacing can be achieved by combining several extenders of differing lengths. Fully metal construction and aluminum process, for long time use. Use this extension tube for the correct image scale or the exact spacing required for reducers or field flatteners. Type: Astronomical Telescope T2 thread Extension Tube