TS Optics Micro Helical T2 1.25″ focuser
Looking for a way to take your telescope focusing to a whole new level of precision? The TS Optics Micro Helical T2 1.25″ is a compact yet cleverly engineered helical focuser that will be appreciated by visual observers seeking fine focus adjustment as well as astrophotographers who need precise control over sensor or eyepiece position. The entire focuser is made from quality aluminium, offering a solid construction at a minimal weight of just 103 grams.
Smooth and backlash-free helical mechanism
Unlike conventional rack-and-pinion focusers, a helical focuser works on the principle of a screw-thread motion - rotating the body of the focuser produces a smooth, backlash-free travel of the tube. The result is an exceptionally smooth action with no sticking or dead travel that would otherwise complicate precise focusing. The Micro Helical T2 helical focuser offers 10 mm of travel, which is more than sufficient for fine focusing when used alongside a telescope's main focuser or for compensating differences in focal distance between various eyepieces and cameras. The overall height of the unit is just 47.5 mm, so it takes up minimal space in the optical path and causes no problems with reaching focus.
Universal T2 connection and 1.25″ output
The focuser is equipped on the input side with a T2 thread (M42x0.75), which is a universal standard in astronomy. This allows it to be easily connected to a wide range of telescopes, reducers, flatteners or photographic adapters. The output side features a standard 1.25″ barrel seat for eyepieces or cameras of the corresponding diameter. Compatibility with other devices depends on the adapter used, so the versatile T2 connection opens up possibilities for a variety of configurations - from visual observation to planetary and deep-sky astrophotography.
Where does the Micro Helical T2 come in handy?
The Micro Helical T2 is useful wherever the telescope's main focuser does not allow sufficiently fine or convenient focusing - for example:
- Refractors with a coarse rack-and-pinion focuser
- Newtonians with an imprecise focuser
- Setups using a Barlow lens and an astro camera, where precise chip-to-optics distance needs to be adjusted
Astrophotographers will particularly appreciate the fact that the helical mechanism does not transmit vibrations the way conventional threaded rings do, and precise focusing in astrophotography becomes significantly more comfortable and repeatable.
Technical specifications
| Parameter |
Value |
| Input thread |
T2 (M42x0.75) |
| Output barrel diameter |
1.25″ |
| Travel |
10 mm |
| Total height |
47.5 mm |
| Weight |
103 g |
| Material |
Aluminium |
Compact and travel-friendly design
If you are looking for a reliable, lightweight and universally usable focusing aid, the TS Optics Micro Helical T2 1.25″ is the logical choice at a very reasonable price. Its compact dimensions and low weight make it an ideal accessory for both travel and stationary setups.
