2 Inch Extension Tube For Telescopes SV158 Back Focus Travel 55mm Optical Length 90mm Total Length Nail The Right Image Scale For Terrestrial Viewing And Astrophotography, Adds Focus Travel, Sturdy Locking Thumbscrews, Easy Setup

2-Inch Telescope Extension Tube with SV158 Back Focus Travel
✔️ Single 2 in SV158 extension tube adds back focus travel

This 2-inch SV158 extension tube adds back travel to your telescope to obtain the correct image scale for terrestrial viewing and astrophotography. It threads to 2 in eyepieces and accepts 2 in filters, with a machined anodized aluminum body and a brass compression ring to protect your telescope barrel. The unit measures 55 mm optical length (2.17 in) and 90 mm total length (3.54 in), and includes two locking thumbscrews for secure setup.

✅ 2-inch extension tube adds back focus travel for terrestrial viewing and astrophotography
✅ Includes two locking thumbscrews to secure accessories
✅ 2-inch threading to fit eyepieces and 2 in filters
✅ Machined aluminum body with anodized finish
✅ Brass compression ring protects the telescope barrel from screw damage
✅ Compatible with 2 in focusers for quick setup and stable alignment

💡 What is a 2-inch extension tube used for back focus adjustment? It increases focuser travel to achieve proper image scale for close-range viewing and astrophotography.
- back focus travel for accurate image scale
- 2-inch eyepiece and filter compatibility
- lockable thumbscrews for stable mounting
- anodized aluminum body with brass compression ring

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