5 Set 2 Inch M42 Extension Tube Kit 5/10/15/30Mm M42X0.75 On Both Sides Brief Description: When you cannot reach the correct focal plane for focusing with a camera or an 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 make it extremely versatile. Use this extender to get the correct image scale or for the exact spacing required for a reducer or field flattener. You can achieve the required extension length by combining several extenders of different lengths. Features: 1, All-metal construction and anodizing aluminum process, durable for long-term use. 2, M42x0.75 on both sides, eliminates a range of focusing problems 3, The required spacing can be achieved by combining several extenders of different lengths 4, This extension tube to get the correct image scale or the exact spacing required for reducers or field flatteners 5, The extension tube has an M42 internal thread and an M42 external thread to solve spacing problems in astrophotography and eliminates a range of focusing problems. 6, Type: Astronomical M42 x 0.75 thread Extension Tube 7, Male thread: M42 x 0.75 mm 8, Female thread: M42 x 0.75 mm 9, Color: Black 10, Net weight: 364.5 g / 12.85 oz 11, Length: 5 mm 10 mm 15 mm 30 mm SIZE: M42 2 inch Material: aluminum Package includes: 20 x M42 x 0.75 Thread Extension Tube (5 mm, 10 mm, 15 mm, 30 mm) Only the above package content, other products are not included. Note: Light reflection 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 +/- 1-3 cm.