Omegon 40mm T2i/T2a T2 extension ring

Omegon T2, 40mm extension tube Omegon T2 40mm T2i/T2a spacerThe extension tube has a T2 interior thread and a T2 exterior thread for elegantly solving spacing problems in astrophotography Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners The spacing required can be achieved by combining several extenders of differing lengths.- T2 interior thread- T2 exterior thread- length 40mm