TS Optics T2/T2 40mm Extension Tube
When building a photographic or visual optical train, you often find yourself just a few millimetres short of the correct focal position. The TS Optics T2/T2 40mm extension tube solves exactly that problem. It features a standard T2 thread on both ends, so you can place it virtually anywhere in your setup - between a camera and an adapter, between two T2 components, or between a telescope and a sensor. A simple solution that saves time and removes the need for awkward compromises.
When do you need a T2 extension tube?
The need to extend an optical train arises in many situations - whether you are shooting at prime focus through a telescope, using a focal reducer or field corrector, or combining accessories with different back focus distances. The 40mm length covers the most commonly required range of extension. In most setups it resolves back focus issues without needing to stack several shorter rings together.
This tube suits both a beginner assembling their first astrophotography setup and an experienced observer fine-tuning the details of a more complex optical train. No modifications or special tools are needed - simply thread it into the correct position in the chain.
Precision machining for reliable results
T2 extension tubes are an essential part of any well-equipped astronomy accessory kit. Their apparent simplicity hides genuine practicality. The thread is precision-machined to ensure a firm, coaxial connection with no play - something that matters greatly in astrophotography, where even slight misalignment affects image quality.
Key features
- Standard T2 thread on both ends
- 40mm extension length
- Compatible with cameras, T2 adapters, focal reducers and field correctors
- Precision-machined thread - firm, coaxial connection with no play
- No tools or modifications required
- Suitable for beginners and experienced users alike
Technical specifications
| Thread |
T2 (M42x0.75) on both ends |
| Extension length |
40 mm |
| Thread type |
Male T2 / Female T2 |
| Brand |
TS Optics |
