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Everyone who likes astronomy knows:Sometimes you cannot get to the right focal plane for focusing with a camera or eyepiece. Now SV157 extension tube can solve your problem.
Brass material to avoid scratches
After you have a new device, you definitely don't want to damage your device because of a connection problem.SV157 extension tube comes with a brass compression, it can help you solve the problem
Built with metal material
Machined of aluminum and anodized black, durable for long time use
Package Includes:
- 1×SVBONY SV157 1.25 " Extension Tube
Compatible with 1.25" telescope focusers
Fits in 1.25" telescope focusers, and accepts 1.25" eyepieces or accessories.Threaded for use with standard 1.25 Inch astrophotography filters
Andrew O
August 30, 2025
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.)
LarryC
August 26, 2025
I needed an extension tube so my QHY 5-II-M camera wouldn't fall out the back of my Orion 50mm mini guide scope. Even with the nose extension, I only had 1/4" of the camera in the scope in order to achieve focus. I have several SVBONY products and while they are definitely "entry level" in price, they have all performed exactly as promised and as needed. The extension tube is no exception. The fit is perfect, the finish looks fine and the threaded bolt to tighten the brass band that hold the guide camera in pace tuns smoothly and holds the camera without any play. I'm very happy with this fordable solution to my guide camera back focus dilemma. I highly recommend this product if you need an 1.25" extension tube.
Philip J. Imbrogno
August 14, 2025
This is sturdy and well built whether you use it as a guide scope or eye piece extender it will perform well.
Charles G. Wilkerson
July 15, 2025
Good product and worth the purchase
Jay S
July 14, 2025
I needed some extra focus stand-off, and this provided it perfectly. Brass compression ring is a nice touch. Metal construction is solid and well fitting. Straight pass-through, so no worries about optical component quality.
Duane51
July 11, 2025
Nice and sturdy.
Allen E. Fenderson
June 28, 2025
Don’t buy. You’ll be sorry if you do. Threaded on an aluminum cylinder only a millimeter thick.
Tony
June 23, 2025
I used this as a guide scope camera extension and was a perfect fit. It’s hard to find back focus parts sometimes even when you have the spec size you need. This fit perfectly!
Customer
June 4, 2025
Excelente producto, calidad superior, bonito diseño y color, llegó super rápido, gracias!!!!!
Andrew O
May 29, 2025
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.)
LarryC
May 25, 2025
I needed an extension tube so my QHY 5-II-M camera wouldn't fall out the back of my Orion 50mm mini guide scope. Even with the nose extension, I only had 1/4" of the camera in the scope in order to achieve focus. I have several SVBONY products and while they are definitely "entry level" in price, they have all performed exactly as promised and as needed. The extension tube is no exception. The fit is perfect, the finish looks fine and the threaded bolt to tighten the brass band that hold the guide camera in pace tuns smoothly and holds the camera without any play. I'm very happy with this fordable solution to my guide camera back focus dilemma. I highly recommend this product if you need an 1.25" extension tube.
Philip J. Imbrogno
April 21, 2025
This is sturdy and well built whether you use it as a guide scope or eye piece extender it will perform well.
Charles G. Wilkerson
April 11, 2025
Good product and worth the purchase
Jay S
February 9, 2025
I needed some extra focus stand-off, and this provided it perfectly. Brass compression ring is a nice touch. Metal construction is solid and well fitting. Straight pass-through, so no worries about optical component quality.
Duane51
January 19, 2025
Nice and sturdy.
Allen E. Fenderson
December 28, 2024
Don’t buy. You’ll be sorry if you do. Threaded on an aluminum cylinder only a millimeter thick.
Tony
December 8, 2024
I used this as a guide scope camera extension and was a perfect fit. It’s hard to find back focus parts sometimes even when you have the spec size you need. This fit perfectly!
Customer
November 29, 2024
Excelente producto, calidad superior, bonito diseño y color, llegó super rápido, gracias!!!!!
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