Telescope Extension Tube Set, 8 PCS Aluminum Alloy M48X0.75 Astronomical Kit 3 5 7 10 12 15 20 30mm Extending Ring for Photography

Focusing Problem Elimination: The extension tube has M48 female thread and M48 male thread, which is used to solve the spacing problem in astrophotography and eliminate a series of focusing problems. Eliminate Redundant Light: Extension tube kit design of female thread can eliminate stray light and reflected light, making the image clearer. Variable Combination: The required spacing can be achieved by combining several extension rings of different lengths, you can use 1, 2, 3 or 8 extension rings as required. Type: Astronomic telescope M48 threaded extension tube, the height of the extension tube is 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm and 30mm. Aluminum Alloy Material: All metal structure and anodized aluminum process, durable, using this extension tube can obtain the correct image scale or the precise spacing required by the reducer or field flattener.