Gosky Astronomical Extension Telescope Eyepieces Review

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. Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners. Includes 4 different lengths - 5mm 10mm 20mm 30mm. The required spacing can be achieved by combining several extenders of differing lengths,you can use 1 pcs, 2 pcs , 3 pcs, 4 pcs or 5pcs of the extension rings as you like. All metal construction and anodizing aluminium process, durable for long time use.