SVBONY SV119 Astronomical Telescope Extension Tube Set 5mm 10mm 15mm 30mm Extension Tube Kit for Camera and Eyepiece Camera Adapter Astronomical

Male thread M48x0.75; female thread M48x0.75; can eliminate various focus problems. Use this extender to get the correct image scale or the exact spacing you need for your reducers and field flatteners. Arrive at the appropriate focal plane for focusing with your camera or eyepiece. 5mm 10mm 15mm 30mm 4pcs extension tube kit. The required spacing can be achieved by combining several extenders of different lengths as desired. Durable and lightweight. Full metal construction and anodized aluminum process are durable for long-term use. The net weight of 72.9g/2.57oz is light and does not put any extra burden on your device. Internal thread design. Internal thread design eliminates stray light and reflected light, resulting in clearer and sharper images when solving spacing problems in astrophotography. This extension tube is used to adjust the focal length. It comes in a set of extension tubes of 5mm, 10mm, 15mm and 30mm, and is made of high-quality aluminum. It is made of all metal and is durable. Can be used for a long time with anodizing technology. The f-number of a telescope is determined by dividing the focal length of the telescope by the aperture of the lens or primary mirror. Extend the focal length and brighten the F-number to widen the field of view. Used for astrophotography, it provides a wide field of view, making it easier to capture expansive nebulas and star clusters.Warranty: We provide a 2-month warranty on optical accessories; within 2 months; customers can get a refund or exchange. Also, if you have any problems, please feel free to contact us by email. Any time is fine. We will definitely respond to this as quickly as possible.