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Your cart is empty.Product Description
5mm 10mm 15mm 20mm 4 pieces length
The required spacing can be achieved by combining several extenders of differing lengths.
You can use 1 piece, 2 pieces or 3 pieces of the extension rings as you like to meet your different needs.
M42x0.75mm Thread
The male thread and female thread of this M42 extension tube are M42x0.75mm, which can attach any M42X0.75mm telescope camera adapter.
Fully metal construction and anodizing aluminum process that makes the M42 extension tube durable and not easy to deform
Duane51
2025-08-29 14:01:55
Seems well built.
Sketch
2025-08-10 12:16:59
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.
R. ODonnell
2025-07-21 17:45:47
These added just the right extension for my Sony NEX6 on a Celestron Nexstar 127slt telescope to be able to focus the camera. Inexpensive solution to a focusing problem. The picture is of the full moon - horribly bright so it makes it hard to see details on the moon's surface. You may want to scuff the inside to avoid stray light reflections. I didn't have that problem, though.
Graf von Foto
2025-06-28 17:54:06
The "features" list of the template have no applicability here!Front and Rear Threads do not align properlyThe aluminum rings are well made and anodized. The screw threads are clean and smooth.There are two down-sides:* The insides of the rings are grooved to reduce reflections, but still too reflective. I may spray paint with matte black.* The threads are not "synchronized"; i.e. the orientation of a camera is not preserved if a ring is added. This requires a major adjustment of something else.The comments are same as those I made for the 8, 25, and 45 mm set of SVBony tubes. This set (5, 10, 15, 20 mm) is more convenient, but spans a narrower range.
Patrick S Sugrue
2025-05-30 11:18:40
Well I just unpacked it and maybe in 2 years time the finish will wear off and it will corrode and emit green smoke and kill my entire family but right now, by every metric available to me, this product is what you would expect to get from Zeiss or NASA. It's perfect. If you put it under a microscope (OK I have not done that) it's perfect. 200 years ago it would cost thousand's of $$$ to make this. You know what, I am not sure we could make this 200 years ago at any price. It cost $20 or something stupid and it came in 3 days.
Russell Davis
2025-05-08 15:12:39
I needed the 10mm extension but had to buy the whole kit, which was no problem but when I got them, the 5mm and 10mm extension were screwed together so tight that I couldn't get them apart. I tried to use channel locks but, in the end, they got damaged trying to get them apart. There was absolutely no way to salvage them. I really needed them the day they arrived, but I was unable to use them.*UPDATE* Since I wrote the first review, SVBONY has reached out to me several time, which I appreciate as I use several of their products. The 2nd set that I received seems to work just fine as I did a mock setup to test everything. Still disappointed that the first set made it through QA like that but in SVBONY's defense it could have been a one-off event. I will give these a field test whenever it stops raining here in Atlanta and change my review as warranted.
Mike Fratto
2025-04-26 11:41:18
Not much to say. Machined well. Connects to similarly threaded things. Sturdy construction.
MARC
2025-04-10 18:44:29
Gave me perfect spacing for my Nikon to focus on an ST80 from Orion,
JG
2025-02-23 18:11:34
Ideal para extender el back-focus en roscas M42
Le prof
2025-01-10 18:22:12
Très bon produit mais il faut savoir que chaque caméra a des grandeurs différentes pour ses tubes optiques.Pour cette raison j’ai retourné les tubes d’extension qui n’étaient pas compatibles avec mon équipement.
Mohammad Al-Saati
2024-12-29 12:06:21
It stays loose at the end of threading. Threads perfectly on my Player One though
Alexei Beteta
2024-12-18 10:40:08
Hace exactamente lo que se supone que debe hacer, es un espaciador.La mayorÃa de las reseñas de una estrella para este producto son erróneas, ya sea por error del cliente o por desconocimiento de su uso.Esto hace exactamente lo que dice, es un espaciador, también necesitarás comprar un soporte helicoidal.y un soporte en T para su cámara que se adapta a su cámara. Vendido por la misma empresa facilita mucho las cosas.1. El espaciador acercará el plano posterior focal, pero 2. el soporte helicoidal lo ajustará perfectamente.[La revisión que dijo que esto no funcionarÃa porque no es precisa solo habla de 1/3 de la solución, nuevamente ignorancia y falta de comprensión óptica.]2. La rosca y el diámetro también son otro factor a tener en cuenta; nuevamente, las revisiones que decÃan que estos no se atornillarÃan en su adaptador no observaron correctamente dos números.a. el diámetrob. el ángulo y la resolución del hilo.Ejemplo para este producto... M42X0,75 mm si su configuración es M42x0,80, ¡no funcionará! Ambos números tienen que coincidir.Entonces, para terminar, necesitará los espaciadores, la montura helicoidal y una montura en T para su cámara, y que TODOS los elementos coincidan con el diámetro y el ángulo/resolución de la rosca.Si compras ambas piezas con el soporte en T, se venden, por lo que TODAS las tres piezas juntas FUNCIONARÃN. Si mezclas y combinas, ¡debes comprobar que TODOS los números coincidan y se alineen!
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