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1. Focusing Problem Elimination: The extension tube has M48 female thread and M48 male thread, which is used to solve the spacing problem in astrophotography and eliminate a series of focusing problems.
2. Eliminate Redundant Light: The design of female thread can eliminate stray light and reflected light, making the image clearer and more perfect.
3. Variable Combination: The required spacing can be achieved by combining several extension rings of different lengths, you can use 1, 2, 3 or 8 extension rings as required.
4. Type: Astronomic telescope M48 threaded extension tube, the height of the extension tube is 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm and 30mm.
5. Aluminum Alloy Material: All metal structure and anodized aluminum process, durable, using this extension tube can obtain the correct image scale or the precise spacing required by the reducer or field flattener.
Specification:
Item Type: Length Extension Tube Kit
Material: Aluminum Alloy
Gross Weight: 107g / 3.8oz
Extension Tube Height: Approx.3mm / 0.1in, Approx.5mm / 0.2in, Approx.7mm / 0.3in, Approx.10mm / 0.4in, Approx.12mm / 0.5in, Approx.15mm / 0.6in, Approx.20mm / 0.8in, Approx.30mm / 1.2in
Thread: M48X0.75
Use:forAstronomicalTelescopePhotography
Package List:
8 x Extending
Robert D.
Reviewed in Canada on May 24, 2024
All the large extension tubes work good together. The problems I had is with the set is 1. No 5 mm. 2. The 3mm internal breads are not deep enough to attach to the other tubes. This ends up with about 4mm minimum extension instead of three, and the tube binds and is not possible to extract afterwards.
Steve
Reviewed in the United States on March 17, 2024
Good selection of tube lengths. Tubes are nicely finished.
Owen O Doherty
Reviewed in the United Kingdom on December 27, 2024
good value for moneyeasy to azsemble
Andy
Reviewed in the United Kingdom on December 10, 2024
Well, first the rings are too large for my T adapter. But on the other hand I can use up to 55mm along with a Barlow to work. But ok.
Robert N peifer
Reviewed in the United States on November 16, 2024
This was needed to achieve perfect back focus on my new astrophotography rig looks and feels like quality materials and allowed me to get perfect fit for my image train.
Richard H.
Reviewed in the United States on April 7, 2024
These rings are quite nice. Though I do wish they would send .05mm shims too. When you're trying to get precise backfocus it always seems that you're withing .05mm or so. Which some say is acceptable. And that's fine. I prefer to be a bit more accurate. And this set has a decent range of thickness. Which is super helpful compared to others that start at 5mm or higher. Really got this just for the 3mm ring. But the additional one will be used for another scope. 10/10 would recommend.
Remo Carbetta
Reviewed in the United States on September 3, 2023
Anybody doing astrophotography knows that you have to have these tubes to correctly space optics and cameras, especially for backspacing.Generally you need to have several different sized rings, so what's nice is this comes as a set with each ring being a different size.They weren't very expensive so I wasn't sure what to expect with the quality but I was pleasantly surprised at the threads are actually smooth but can also get just a little smoother by wiping them off.The tube construction seems substantial enough to be strong enough not to flex while being used.Overall I'd say I am happy with this purchase and would recommend it!
Keith Mombourquette
Reviewed in Canada on June 10, 2023
These screw to each other with no problem, but all of the items I am trying to use them with have longer male threads than these will accept. They will not thread up to the shoulder of the mating piece.
Matt Compton
Reviewed in the United States on December 21, 2023
Works great, M48X0.75 threads work as expected with camera and adapters and so forth.
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