The extension tube has a M48*0.75 interior thread and a M48*0.75 exterior thread for elegantly solving spacing problems in astrophotography.
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.
Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners.
Male thread - M48*0.75. Female thread - M48*0.75, eliminates a range of focusing problems.
All metal construction and anodizing aluminium process, durable for long time use.
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