Alstar Astronomical T2-Extension Tube Kit for Cameras and eyepieces - Length 8mm 10mm 20mm 40mm - M42x0.75 on Both Sides

Additional Details from the Manufacturer

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More features

• 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
• 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
• Male thread: M42x0.75; Female thread: M42x0.75; Eliminates a range of focusing problems