SVBONY SV157 Extension Tube
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The SVBONY SV157 is a 1.25-inch telescope eyepiece extension tube that adds 34mm of optical length to help achieve focus with cameras, Barlows, or eyepieces that need extra back-focus distance. It accepts standard 1.25-inch filters on both ends, making it a versatile spacer for a range of optical setups. Overall, it is a compact and practical accessory that fills a common gap in telescope configurations at an affordable price point.
Key Features & Specs
| Barrel Size | Standard 1.25-inch, compatible with most telescopes and focusers accepting this format |
|---|---|
| Optical Length | 34mm extension to increase back-focus distance between focuser and eyepiece or camera |
| Filter Threads | Accepts standard 1.25-inch filters on both the input and output ends |
| Outer Diameter | 56mm outer body diameter providing a sturdy grip and easy handling |
| Material | Metal construction with a matte black interior to reduce internal reflections and stray light |
| Compatibility | Works with eyepieces, Barlow lenses, cameras, and other 1.25-inch accessories |
| Use Case | Designed to solve focus travel issues when direct coupling leaves insufficient back-focus distance |
Best for: Amateur astronomers and astrophotographers who need a reliable, low-cost spacer to achieve proper focus when using cameras, Barlow lenses, or eyepieces with limited back-focus travel on their 1.25-inch telescope setup.