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The SVBONY SV157 Extension Tube is a 1.25-inch, 70mm total length optical accessory designed to extend your telescope’s focus range by 40mm. Made from durable all-metal materials, it features threaded ends compatible with standard 1.25" filters, an anti-reflective fully threaded interior, and a brass compression clamp to protect your equipment. Ideal for professional and enthusiast astronomers seeking enhanced clarity and versatile accessory integration.
| ASIN | B083TQHTLG |
| Best Sellers Rank | #48 in Telescope Photo Adapters |
| Brand | SVBONY |
| Compatible Devices | Telescope, Camera, Filter |
| Customer Reviews | 4.5 out of 5 stars 72 Reviews |
| Eye Piece Lens Description | Plossl |
| Finderscope | Reflex |
| Focal Length Description | 40 millimeters |
| Focus Type | Manual Focus |
| Item Dimensions D x W x H | 4"D x 2"W x 2"H |
| Item Highlight | Extension Tube, Help Eyepiece and Camera Focus, Full metal Design, Bottom Thread, Brass Compression |
| Item Weight | 47 g |
| Manufacturer | SVBONY |
| Manufacturer Part Number | FW9118B |
| Model Number | FUSW9118B |
| Mount | 1.25 inches mount |
| Number of Items | 1 |
| Objective Lens Diameter | 7 centimeters |
| Optical Tube Length | 7 centimeters |
| Optical-Tube Length | 7 centimeters |
| Product Dimensions | 4"D x 2"W x 2"H |
| Telescope Mount Description | 1.25 inches mount |
| Warranty Description | We provide 1 year warranty for SVBONY telescope accessories and 30 days no reason to return. Beyond the warranty period: We still offer maintain service, buyers are required to afford corresponding costs. We processed in the most hassle-free way possible.You just need to contact with us on Amazon ,we will reply you within 12 hours |
C**D
great
very good well build
A**O
Great product
This extension tube has standard 1.25" diameter threads to attach filters or other components. I use this with a 0.5x focal reducer attached to the end, plus a light pollution filter. The threads seem high quality. This is a nice long tube that allows me to attain proper back focus for the reducer. I attached an image of how it fits into my setup -- the camera goes into the extension tube at the correct depth, and the extension tube + reducer + filter goes into the eyepiece holder, connected to the visual back. (I plan to test this without the diagonal as well, which should work theoretically). The collar of the extension tube holding the camera in place is secure and I didn't have any issues with it moving during my captures. I'm able to achieve perfect focus (using Bahtinov mask) from 0.5x to 0.33x reduction with no noticeable star aberrations. (Telescope is Celestron 8", camera is QHY5iii715C, and the focal reducer is from Apertura.)
M**E
It is what I wanted
It is what I wanted
D**D
Clean extension
Slender unit and hopefully it’ll do what I need next time it’s necessary.
S**N
Plain and simple, it works.
Looking to get that extra bit of back focus for not a lot of money? Here ya go.
A**R
For back focus for a refreactor telescope - SVBony 503 70ED
I bought this for my SVBony 503 70ED to pair with Canon T2i for the back focus. Without this spacer/extender, my T2i will not focus. However, I noticed that you cannot insert the spacer completely into the back focus. You'll need to leave a little space otherwise, you won't get focus. If you don't want to use the spacer, you can get a diagonal to get focus.
D**1
Nice product.
Nice and sturdy.
H**H
Works Perfectly, Very Well Made !
Works Perfectly, Very Well Made ! Another SVbony quality product at a very affordable price.
A**R
Excelente producto!
Excelente producto, calidad superior, bonito diseño y color, llegó super rápido, gracias!!!!!
Trustpilot
3 days ago
3 weeks ago