Astronomical Telescope T2 Extension Tube Ring 5/10/15/20/30mm

Fully metal construction and anodizing aluminum process, durable for long time useUse this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners.The extension tube has a T2 interior thread and a T2 exterior thread for solving spacing problems in astrophotography and eliminates a range of focusing problems.Type: Astronomical T2 thread Extension TubeLink or extend tube length of the M42*0.75 ProductsColour:blackMaterial:aluminumSize:5mm,10mmm,15mmm,20mm,30mmMale thread: M42*0.75mmFemale thread: M42*0.75mmPackage Contents:5 * M42x0.75 Telescope extension TubeOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.