---
product_id: 77767697
title: "SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm"
brand: "svbony"
price: "€ 45.21"
currency: EUR
in_stock: true
reviews_count: 13
category: "Svbony"
url: https://www.desertcart.fi/products/77767697-svbony-extension-tube-m42x0-75-on-both-sides-length-t2
store_origin: FI
region: Finland
---

# Modular lengths: 5,10,15,20mm Precision M42x0.75 threading Durable anodized metal build SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm

**Brand:** svbony
**Price:** € 45.21
**Availability:** ✅ In Stock

## Summary

> 🔭 Elevate your astrophotography game with precision and style!

## Quick Answers

- **What is this?** SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm by svbony
- **How much does it cost?** € 45.21 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/77767697-svbony-extension-tube-m42x0-75-on-both-sides-length-t2)

## Best For

- svbony enthusiasts

## Why This Product

- Trusted svbony brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Optimize Your Focus:** Eliminates focusing issues by providing precise spacing for reducers and field flatteners.
- • **Customizable Extension:** Choose from 5mm to 20mm tubes to dial in exact backfocus and image scale.
- • **Seamless Compatibility:** Fits perfectly with M42x0.75 T2 astrophotography gear for flawless integration.
- • **Rugged Metal Durability:** Anodized aluminum construction ensures long-lasting, reliable performance under all conditions.
- • **Pro-Level Astrophotography:** Trusted by enthusiasts to achieve professional-grade telescope imaging setups.

## Overview

The SVBONY Extension Tube Kit offers four anodized aluminum tubes (5, 10, 15, 20mm) with M42x0.75 T2 threading on both ends, designed to provide precise spacing solutions for astrophotography setups. Its durable metal construction ensures longevity, while the modular lengths allow users to customize backfocus and image scale, optimizing focus and compatibility with reducers, field flatteners, and camera adapters.

## Description

desertcart.com : SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm : Electronics

Review: Great Quality 5mm and 10 mm stuck together SVBONY reached out to me to correct the issue - Great quality and value. Unfortunately, the 5 mm and the 10mm are stuck together. I tried filter wrenches to separate them, which didn't work, so I wrapped them in tape and used pipe wrenches, but that still didn’t work. I will assemble everything tomorrow that I purchased it for, and we will see if I need them separated. I also bought the Variable Extension Tube, so I hope to use it to achieve the precise length I need. Just an update SVBONY reached out to me offering a refund on this product. I was very impressed. I planned to order another set and a few other items they make because the quality and value are very good, and that gesture made me a definite SVBONY customer.
Review: Perfect for backfocus - These extension tubes screw right onto the celestron T adapter that fits onto the .7 focal reducer. Nicely machined, very happy now that I've achieved 105 mm of backfocus. Great value. Also my new ZWO ASI 294 screwed right onto the T adapter. Edit...... Dont let them get stuck together, using channel locks to get them apart destroys them. Store them apart. You may find you need to paint them inside with a flat black paint. They seem to be glossy and I have had an issue with reflection. A quick spray fixed that.

## Features

- Fully metal construction and anodizing aluminum process;durable for long time use
- Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners
- T2 interior thread and T2 exterior thread for solving spacing problems in astrophotography and eliminates a range of focusing problems
- Astronomical T2 thread extension tube;male thread:M42x0.75mm;female thread: M42x0.75mm
- Link or extend tube length of the M42*0.75 products;Male thread;M42*0.75mm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07BKYQF1H |
| Best Sellers Rank | #36 in Telescope Photo Adapters |
| Customer Reviews | 4.5 4.5 out of 5 stars (210) |
| Date First Available | March 20, 2018 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2.08 ounces |
| Item model number | FUSF9160A |
| Manufacturer | SVBONY |
| Product Dimensions | 2.4 x 2.4 x 2 inches |

## Product Details

- **Brand:** SVBONY
- **Eye Piece Lens Description:** NO
- **Finderscope:** Reflex
- **Focus Type:** Manual Focus
- **Item Weight:** 0.13 Pounds
- **Model Name:** FUSF9160A
- **Objective Lens Diameter:** 20 Millimeters
- **Optical Tube Length:** 20 Millimeters
- **Product Dimensions:** 2.4"D x 2.4"W x 2"H
- **Telescope Mount Description:** M42x0.75

## Images

![SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm - Image 1](https://m.media-amazon.com/images/I/51Y4cDuPUeL.jpg)
![SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm - Image 2](https://m.media-amazon.com/images/I/51g-KkW0gpL.jpg)
![SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm - Image 3](https://m.media-amazon.com/images/I/61EQFLUyiCL.jpg)
![SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm - Image 4](https://m.media-amazon.com/images/I/61eTjnvtRhL.jpg)
![SVBONY Extension Tube M42x0.75 on Both Sides Length T2 Extension Tube Kit Length 5mm 10mm 15mm 20mm - Image 5](https://m.media-amazon.com/images/I/61pLaaCLW4L.jpg)

## Questions & Answers

**Q: will this product fit the SV305 pro?**
A: I'd contact SyBony directly - they make both the SV305 camera and this helicoid.  The "1/25in" spec is common for telescope eyepiece accessories including cameras, but this version (they make others) of the helicoid has 42x0.75mm threads (T-mount) on both sides, implying another model or an additional adapter.

**Q: what is the outside diameter?**
A: Dear customer ,
Thanks for your contact.
1.77inch.

For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win.
If my reply still doesn't answer your question well or you want to know more details about this product,please contact us by message on Amazon. Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. 
Sincerely look forward to your reply.
Best wishes !
Kelly

**Q: Will this fit on my 1.25" eyepiece / camera?**
A: Dear customer ,
Thanks for your contact.
SVBONY Extension Tube has M42x0.75 male thread and M42x0.75 female thread. It cannot be directly connected to the 1.25-inch eyepiece, but can be connected to the camera through an adapter ring. Generally used to solve spacing problems in astrophotography.

For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win.
If my reply still doesn't answer your question well or you want to know more details about this product, please contact us by message on Amazon. Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply.
Best wishes !
Kelly

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Quality 5mm and 10 mm stuck together SVBONY reached out to me to correct the issue
*by S***B on December 13, 2025*

Great quality and value. Unfortunately, the 5 mm and the 10mm are stuck together. I tried filter wrenches to separate them, which didn't work, so I wrapped them in tape and used pipe wrenches, but that still didn’t work. I will assemble everything tomorrow that I purchased it for, and we will see if I need them separated. I also bought the Variable Extension Tube, so I hope to use it to achieve the precise length I need. Just an update SVBONY reached out to me offering a refund on this product. I was very impressed. I planned to order another set and a few other items they make because the quality and value are very good, and that gesture made me a definite SVBONY customer.

### ⭐⭐⭐⭐⭐ Perfect for backfocus
*by S***H on April 9, 2021*

These extension tubes screw right onto the celestron T adapter that fits onto the .7 focal reducer. Nicely machined, very happy now that I've achieved 105 mm of backfocus. Great value. Also my new ZWO ASI 294 screwed right onto the T adapter. Edit...... Dont let them get stuck together, using channel locks to get them apart destroys them. Store them apart. You may find you need to paint them inside with a flat black paint. They seem to be glossy and I have had an issue with reflection. A quick spray fixed that.

### ⭐⭐⭐⭐⭐ Nice product.
*by D***1 on August 3, 2024*

Seems well built.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.fi/products/77767697-svbony-extension-tube-m42x0-75-on-both-sides-length-t2](https://www.desertcart.fi/products/77767697-svbony-extension-tube-m42x0-75-on-both-sides-length-t2)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-28*