Binorum SuperStrong T2 20mm Extension Tube - Maximum Backfocus Configuration
The Binorum SuperStrong T2 20mm extension tube represents the maximum standard spacing component for serious astrophotographers building highly specialized optical systems. This T2 20mm extension tube provides the extended intermediate distance required by photographers operating at the frontiers of observational astronomy - combining long focal length Barlows with powerful focal reducers, incorporating sophisticated filter assemblies, and integrating secondary optical correction elements. When no standard tube suffices, the 20mm dimension delivers.
Technical Specifications and Specialized Configurations
Precision-manufactured with 20mm optical length and standard T2 threading (M42x0.75), this extension tube accommodates the most demanding optical architectures. The 20mm dimension is specifically engineered for systems requiring total backfocus exceeding 85mm - scenarios encountered by astronomers combining extreme focal length Barlow lenses (70-80mm) with quality focal reducers. Black anodized interior coating maintains optical integrity across extended optical chains where parasitic reflections accumulate multiplicatively.
Why Specialized Systems Demand 20mm Spacing
Advanced astrophotographic systems sometimes require unconventional architecture: ultra-long Barlow lenses for exceptional planetary magnification, combined with focal reducers for deep-sky wide field capability, with integrated filter wheels and field flatteners. Each component contributes to cumulative spacing demands. A single 7mm or 12mm tube cannot bridge these gaps without violating manufacturer backfocus specifications. The 20mm tube solves this elegantly, allowing you to build ambitious optical systems without compromise or creative workarounds.
Specialized Applications and Edge-Case Solutions
The 20mm tube addresses situations demanding maximum flexibility: integrating secondary optical correction for specific atmospheric conditions, accommodating retrofit installations where existing components cannot be repositioned, or building dual-path imaging systems where one configuration requires extended spacing. Additionally, when combining experimental optical elements or custom-built components with standard accessories, the 20mm tube provides the spacing margin that experimental work demands.
Advanced System Architecture
For photographers building avant-garde imaging systems transcending standard configurations, the 20mm tube is the foundation. Combine it with other extension tubes (7mm, 10mm, 12mm, 15mm) to construct virtually any spacing configuration your imagination and specifications demand. The 20mm tube enables genuine optical system customization.
Binorum Engineering Standards
Like all Binorum SuperStrong components, the 20mm tube is precision-calibrated to verify exact 20mm optical length and thread integrity. Superior materials, exacting machining tolerances, and black anodized finishing ensure performance reliability in the most demanding applications.
Conclusion
The Binorum SuperStrong T2 20mm extension tube is for advanced astrophotographers building specialized systems that transcend standard configurations. When your imaging ambitions demand maximum spacing flexibility and your optical system exceeds conventional architecture, this tube provides the extended dimension that empowers genuine system customization and experimental optical exploration.
