Alstar M42 Extension Tube Kit for Cameras and Eyepieces (5/10/20/40mm)

Sometimes you cannot get to the right focal plane for focusing with a camera or eyepiece. This extension tube kit solves this problem. You can use this extender with any camera or eyepiece or with various adapters. The M42*0.75 threads on both ends make it extremely versatile. Use this extender for obtaining the correct image scale or for the exact spacing required for a reducer or field flattener. You can reach the extension length required by combining several extenders of different lengths.

• 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
• Male thread: M42x0.75; Female thread: M42x0.75; Eliminates a range of focusing problems
• The extension tube has a T2 interior thread and a T2 exterior thread for elegantly solving spacing problems in astrophotography
• All metal construction and anodizing aluminium process for long time use
• Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners