1. Eliminating Focusing Problems: The extension tube features M48 female thread and M48 male thread, which solves the distance problem in astrophotography and eliminates a number of focusing problems.
2. Eliminate Excess Light: The internal thread design can eliminate flare and reflected light, making the picture clearer and more perfect.
3. Variable Combination: The desired distance can be achieved by combining multiple extension rings of different lengths, you can use 1, 2, 3 or 8 extension rings according to your needs.
4. Type: Astronomical Telescope M48 Thread Extension Tube, the height of the extension tube is 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm and 30mm.
5. Aluminum alloy material: all-metal structure and anodized aluminum process, durable. With this extension tube, you can achieve the correct image scale or the exact distance needed by the reducer or field flattener.

Specification:
Item Type: Length Extension Tube Kit
Material: Aluminum Alloy Gross Weight: 107g / 3.8oz Extension Tube Height: Approx. 3mm / 0.1inch, Approx. 5mm / 0.2inch, Approx. 0.7mm / 0.3inch 10mm/0.4, about 12mm/0.5, about 15mm/0.6, about 20mm/0.8, about 30mm/1.2. inch
Thread: M48X0.75
Use: for astronomical telescope photography

Packing list:
8 x extension