Please make sure this is the correct size and thread before purchasing; If you have any problems about your purchase, please don't hesitate to contact us and We will make it right. Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners. Please Note: This is M42 (42mm) thread caliber, not M48 thread caliber. Fully metal construction and anodizing aluminum process, durable for long time use. The extension tube has a T2 interior thread and a T2 exterior thread for solving spacing problems in astrophotography and eliminates a range of focusing problems.
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