2X M42 Extension Tube Kit 3/5/7/10/12/15/20/30mm M42X0.75
2X M42 Extension Tube Kit 3/5/7/10/12/15/20/30mm M42X0.75 for Astronomy Professional Telescope Astrophotography Yoeruers SIZE: M42 x 0.75Type: MonocularExtension Tube Height: 3mm 5mm 7mm 10mm 12mm 15mm 20mm 30mmWhy use itsWhen you cannot get to the right plane for focusing with a camera or eyepiece. This extension tube kit solves this problem. You can use this extender with any camera or eyepiece or with various adapters. The M42 x 0.75 threads on both ends extremely versatile.Use this extender for obtaining the correct image scale or for the exact spacing required for a reducer or field flattener.You can reach the extension length...