TS Optics T2 to 1.25″ Adapter
The TS Optics T2 to 1.25″ adapter is a simple, reliable accessory that connects any standard 1.25″ astronomy accessory to any optical device with a T2 thread (M42x0.75 mm). It is a useful addition for any observer who works with both T2-threaded optics and the wide range of 1.25″ accessories available on the market.
What Can You Connect?
This adapter opens up a range of connection options:
- 1.25″ eyepieces - connect them directly to spotting scopes or camera lenses with a T2 thread
- Autoguiders with a 1.25″ input - attach them to a mount or telescope via the T2 interface
- Small CCD cameras or planetary cameras with a 1.25″ barrel
- Other 1.25″ adapters and accessories in more complex optical setups
The accessory is held securely in place by a knurled locking screw. You can attach and release it quickly - no tools needed.
Build Quality and Design
The adapter is machined from quality aluminium with a black anodised finish. This protects the surface against scratches and everyday wear, whether you use it in the field or at an observatory.
The overall length is 33 mm. The optical path length - the additional back focus introduced by the adapter - is only 5.5 mm. This means the effect on your focus position is minimal. The compact size and low weight make it easy to include in any kit bag.
Technical Specifications
| Parameter |
Value |
| Thread (T2 end) |
M42 x 0.75 mm |
| Barrel diameter (1.25″ end) |
1.25″ (31.75 mm) |
| Overall length |
33 mm |
| Optical path length (back focus shift) |
5.5 mm |
| Material |
Aluminium, black anodised |
| Locking mechanism |
Knurled locking screw, tool-free |
About TS Optics
TS Optics is a well-established manufacturer and supplier of astronomical optics and accessories. Their products are known for precise construction, consistent reliability, and broad compatibility with standard astronomy interfaces. This T2 to 1.25″ adapter is a clear example - straightforward, well-made and built to last. It suits both entry-level observers and experienced astronomers alike.
Why Choose This Adapter?
If you need to bridge the gap between T2 optics and 1.25″ accessories, this adapter does the job without fuss. It is compact, durable and fully compatible with the wide range of 1.25″ accessories available today. Whether you are building a visual observing setup or assembling a guided imaging system, this small accessory can make a real difference to your flexibility at the eyepiece.
