Alstar Astronomical 2"/M48-extension Tube Kit for Cameras and eyepieces - Length 5mm 8mm 10mm 30mm - M48x0.75 on Both Sides

Features & details Features 【Eliminate Focusing Problem】The extension tube has a M48*0.75 interior thread and a M48*0.75 exterior thread, elegantly solves the spacing problems in astrophotography and eliminates a series of focusing problems.

【Variable Combination】 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.

【Aluminium Alloy Material】High-quality all-metal construction and anodizing aluminium process, durable for long time use.

【Eliminate Extra Light】The design of the internal thread can eliminate stray light and reflected light, making the image clearer and perfect