Vowenx · Photo, video & capture
T2 extension tube M42x0.75 for astrophotography
In astrophotography, the proper spacing between the camera and the optics determines sharpness. This T2 extension tube (M42x0.75) precisely adjusts this spacing, made of aluminum, to achieve the distance of a reducer or a field corrector.
Note de 4.6/5 basée sur 35 avis clients.Size: 20 mm
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Product details
In use, this extension tube solves a specific but crucial problem in astrophotography: backfocus, that is, the distance between the sensor and the optics. With standard T2 threading (M42x0.75) male and female, it is inserted into the optical train to achieve the exact spacing required by a focal reducer, a field flattener, or another accessory — a difference of a few millimeters is enough to ruin focus or distort stars at the edges. Made of black anodized metal, it is sturdy and lightweight. Eight lengths (from 3 to 30 mm) allow you to compose the ideal backfocus. No more blurry stars due to incorrect spacing; now you can achieve precise focus, provided you know the required backfocus.
Compatibility and uses
This extension tube uses the standard M42x0.75 T2 threading, male on one side and female on the other: it fits between two T2-threaded elements (camera via T-ring, reducers, field flatteners, eyepieces, telescopes). It is used to adjust backfocus in astrophotography. Available in 8 lengths (3 to 30 mm) to be combined according to the backfocus required by your equipment. Check that your components are indeed T2 standard (M42x0.75) and calculate the necessary backfocus.
Technical specifications
- Brand: Vowenx
- Type: T2 extension tube (astrophotography)
- Threading: M42x0.75 (T2), male and female
- Usage: Optical backfocus adjustment
- Material: Black anodized metal
- Lengths: 3, 5, 7, 10, 12, 15, 20 or 30 mm
- Compatibility: Reducers, field flatteners, T-rings
- Color: Black
- Focus: Manual
- Weight: 0.03 kg
Usage advice
Team tip: calculate the backfocus required by your reducer or corrector, then combine several lengths to achieve it.
Presentation
In astrophotography, a few millimeters of backfocus separate sharp stars from distorted ones. This T2 extension tube (M42x0.75) adjusts this spacing between the camera and the optics, to respect the distance of a reducer or corrector. Made of anodized metal, available in eight combinable lengths.
Key features
- Standard T2 threading: M42x0.75 male and female.
- Backfocus adjustment: For reducers and correctors.
- Anodized metal: Sturdy and lightweight.
- 8 lengths: From 3 to 30 mm to combine.
Who is it for?
For the astrophotographer who adjusts their optical train. And for anyone who wants to achieve the exact backfocus of a reducer or field corrector.
Frequently asked questions
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Frequently asked questions
What is this tube used for?
To adjust the draw (spacing) between the camera and the lens in astrophotography.
What thread?
The standard T2, M42x0.75, male and female.
With which equipment?
Reducers, field correctors, T rings, T2 standard telescopes.
What lengths?
3, 5, 7, 10, 12, 15, 20 or 30 mm.
How to choose?
Depending on the required draw; several tubes are combined as needed.
What is it made of?
Made of metal with a black anodized finish.
