Binorum SuperStrong M48 3mm Extension Tube
The Binorum SuperStrong M48 extension tube with 3mm length represents precision optical accessory designed for fine-tuning backfocus in astronomical telescopes and photographic systems. This compact yet robustly engineered tube enables achieving optimal distance between the objective and detector, which is crucial for obtaining perfectly sharp images in astrophotography.
Superior Construction and Design
The construction of the SuperStrong series tubes is designed with emphasis on maximum mechanical stability and precision. Standard M48 threading on both ends ensures universal compatibility with a wide range of astronomical instruments including refractors, reflectors, and catadioptric systems. The material is carefully selected to minimize thermal deformations and ensure long-term stability of the optical axis.
The precise 3mm length was chosen based on practical needs of astrophotographers who often need to finely adjust backfocus when using different cameras, focal reducers, or correctors. Backfocus adjustment is critical especially when working with fast optical systems, where even minimal deviation can significantly affect the quality of resulting images across the entire detector surface.
Technical Specifications and Features
- Threading: M48 x 0.75 on both ends
- Length: 3mm (±0.1mm tolerance)
- Material: High-grade aluminum alloy
- Inner diameter: 44mm (optimized for large sensors)
- Weight: Approximately 15g
- Finish: Matte black anodized
- Temperature range: -20°C to +60°C
The tube features precisely machined threading with smooth operation that ensures reliable and secure connection without risk of damaging threads on connected components. The inner diameter is optimized to minimize vignetting even when used with large detectors while providing sufficient mechanical rigidity for the entire assembly.
Practical Applications
In practice, extension tubes are primarily used when assembling complex optical trains where specific distances between individual components need to be achieved. Typical applications include combinations with focal reducers, coma correctors, filter wheels, or adapters for various camera types. Many astrophotographers utilize sets of tubes with different lengths for flexible adjustment according to current needs.
A quality M48 extension tube is an indispensable helper when switching between different photographic setups, when compensating for different detector thicknesses, or when experimenting with various optical element combinations. Stable mechanical connection is as important as optical quality, because any loosening or play can lead to image blur during long exposures.
Universal Compatibility
The M48 threading is a widely adopted standard in astronomy, found on most modern refractors, many reflectors equipped with correctors, and specialized astrophotographic lenses. This tube is therefore compatible with products from most leading astronomical equipment manufacturers including brands like Celestron, Sky-Watcher, William Optics, Takahashi, and many others.
Compatible Systems Include:
- Apochromatic refractors (80mm - 200mm)
- Fast Newtonian reflectors with correctors
- Schmidt-Cassegrain telescopes with reducers
- Dedicated astrophotography lenses
- Various CCD and CMOS camera systems
Installation and Usage
Installation is straightforward and requires no special tools. The tube simply screws between two components of the optical train, with care taken to ensure threads are properly aligned and the tube is tightened with appropriate force. When working with expensive components, we recommend using specialized thread tools to prevent damage.
Installation Tips:
- Clean all thread surfaces before assembly
- Hand-tighten initially to ensure proper alignment
- Use appropriate torque - firm but not excessive
- Check for any light leaks in the connection
- Test mechanical stability before imaging sessions
Why Choose Binorum Brand
Binorum is a brand created by astronomers for astronomers, specializing in manufacturing quality accessories for astronomical observation and astrophotography. The brand's philosophy is based on deep understanding of users' practical needs and emphasis on precise craftsmanship of every detail. Binorum products undergo thorough testing under real conditions to meet the high demands of discerning observers. The wide portfolio of accessories corresponds to diverse solutions for various types of astronomical applications, from visual observation to advanced astrophotography. Choosing the Binorum brand is an investment in reliability and quality that will be evident in every observation or photographic session. The extensive range of astronomical accessories ensures that amateur and professional astronomers alike can find the precise tools they need for their specific requirements.
