ASToptics 1.25″ Helical Focuser (M42/T2)
Product Overview
The ASToptics helical focuser represents a high-quality solution for precise focusing of astronomical instruments. This focuser is designed with universal T2 connection (M42x0.75) and 1.25″ output, ensuring compatibility with a wide range of telescopes, eyepieces, and cameras. The helical design allows smooth and precise distance adjustment without rotating the connected components.
Technical Specifications
- Input connection: T2 thread (M42x0.75)
- Output: 1.25″ (31.8mm)
- Material: Black anodized aluminum
- Length range: 43-53mm
- Weight: 93 grams
- Design: Helical focusing mechanism
- Locking screw included
Construction and Design
The focuser is manufactured from black anodized aluminum, which ensures corrosion resistance and minimizes internal light reflections. The compact construction with a length range from 43 to 53mm provides sufficient space for fine focusing while maintaining minimal weight of 93 grams. A locking screw allows fixation in the desired position and prevents unwanted movement during observation.
Key Applications
Precision Focusing
This helical focuser finds application in several key areas of astronomy. Primary use lies in precision focusing, especially in cases where the original telescope focuser has insufficient quality or precision. The focuser is ideal for lunar and planetary astrophotography using compact digital cameras, where achieving sharp focus is crucial.
Telescope Building
A significant application is also in amateur telescope construction, where it provides professional-level focusing mechanism at an affordable price. Thanks to the universal T2 connection, the focuser can be easily integrated into various optical assemblies and combined with adapters for different types of cameras and eyepieces.
Astrophotography
The focuser excels in astrophotography applications where precise focus is critical. Its helical design ensures that cameras and eyepieces do not rotate during focusing, maintaining proper orientation for imaging and observation.
Key Advantages
- No rotation during focusing - eyepiece or camera maintains orientation
- Smooth helical operation for precise adjustment
- Universal T2 connection for maximum compatibility
- Robust anodized aluminum construction
- Compact and lightweight design
- Locking mechanism for stable positioning
- Minimized internal reflections
Benefits for Astronomers
The key advantage of this focuser is that the eyepiece or camera does not rotate during focusing operation, which is essential for astrophotography and precise observation. The locking screw ensures maintaining precise focus position even during longer observing sessions or when vibrations are caused by wind.
Universal connection through T2 thread and 1.25″ output provides maximum flexibility when used with different types of accessories. Robust construction from anodized aluminum guarantees long service life and reliability even with frequent use in demanding conditions.
About ASToptics Brand
ASToptics is a renowned brand specializing in the manufacture of quality astronomical accessories and optical components. The company was founded by astronomers for astronomers with a clear goal of providing reliable and affordable solutions for astrophotography and observation. The ASToptics brand is characterized by emphasis on precision manufacturing, quality materials, and practical innovations that facilitate work with astronomical equipment. Thanks to an extensive range of adapters, focusers, filters, and other accessories, ASToptics has gained the trust of astronomers worldwide and has become synonymous with quality in the field of astronomical accessories.
