Binorum SuperStrong T2 7mm Extension Tube - Precision Backfocus Solution
The Binorum SuperStrong T2 7mm extension tube is precisely what technically oriented astronomers and astrophotographers need when they refuse to compromise on optical quality and mechanical stability. This T2 extension tube is not merely another adapter - it is a critical optical component for achieving perfect backfocus in astrophotographic systems where every millimeter means the difference between sharp deep-sky images and blurred failures.
Technical Specifications and Optical Characteristics
The Binorum SuperStrong T2 7mm tube operates with a precise optical length of 7mm that can be reliably calculated into your system's total backfocus specifications. Both ends feature the standard T2 thread (M42x0.75), making it universally compatible with all optical components utilizing this industry standard. Unlike cheaper alternatives, this extension tube is engineered with optical precision in mind - the internal surfaces are meticulously finished to minimize parasitic reflections and diffraction that degrade image quality.
Why Backfocus Matters - Technical Explanation
Backfocus is the distance from the last optical surface (typically a Barlow lens, focal reducer, or field flattener) to your camera's sensor plane. Incorrect backfocus causes spherical aberrations, field curvature, and most critically, image blur even with perfect focusing. Professional astrophysicists and experienced amateurs have long understood that a single millimeter too much or too little can mean the difference between a publishable image and a wasted observing session. The Binorum SuperStrong T2 7mm extension tube gives you precise control - with its 7mm length, you can fine-tune your optical chain's backfocus to exact specifications.
Practical Applications and System Combinations
This extension tube is invaluable in numerous situations: combining Barlow lenses with focusers when you need to shift the focal plane without sacrificing optical quality; working with camera T-ring adapters where default backfocus doesn't match your field flattener specifications; assembling complex optical chains where standard 4mm or 12mm tubes are insufficient. With its precise 7mm length, this tube elegantly bridges the gap between other system components.
Binorum Engineering Excellence
The "SuperStrong" designation is not marketing rhetoric - it represents guaranteed mechanical and optical standards. Each extension tube is precision-machined from high-quality polished metal with minimal tolerance deviations. T2 threads are cut with extreme precision to ensure secure, wobble-free seating. The internal surface is not simply smooth - it is black anodized to eliminate parasitic reflections that degrade contrast in long-exposure imaging. Every unit is calibrated before shipment to verify the declared 7mm length.
Integration into Astrophotographic Chains
The T2 system's modularity means this extension tube can be inserted virtually anywhere in your optical chain - between telescope and Barlow, between Barlow and focal reducer, between focal reducer and field flattener. Compatibility with any T2 component is guaranteed at 100%. The absence of light loss or optical aberrations during passage through the tube means it functions purely as a mechanical and geometric component without degrading light transmission or qualitative system parameters.
Precise Backfocus Calculations
If you work with exact specifications for your accessories - for example a field flattener requiring 55mm backfocus from the sensor, or a Barlow with 45mm optical length - this extension tube provides the precise tool for achieving your required configuration. Binorum guarantees the declared 7mm is accurate to one-hundredth of a millimeter, a tolerance more than sufficient for astrophotography.
Binorum Quality - Why Technicians Trust It
Binorum is recognized among astrophotographers and astronomy technicians for unprecedented value-for-money. Binorum products undergo rigorous compatibility and mechanical stability testing. This extension tube is no exception - every unit is verified to perform reliably for decades without thread degradation or surface deterioration. Investment in Binorum means investment in reliability you can depend on during critical observing nights.
Complementary Components
The Binorum SuperStrong T2 7mm extension tube forms the foundation of a modular system. Combine it with additional extension tubes (4mm, 12mm, 20mm), reduction adapters, and Binorum field flatteners to create the ideal optical system precisely matching your specifications and requirements.
Conclusion
For technically oriented astronomers and professional astrophotographers, the Binorum SuperStrong T2 7mm extension tube is an indispensable component in your equipment arsenal. It combines precise optical and mechanical quality with the practical modularity of the T2 system. If you need a guaranteed 7mm length to achieve perfect backfocus in your astrophotographic system, this is the solution that will not disappoint.
