Binorum Super Plössl 7.5mm 50° SPL 1.25″ Eyepiece
Premium 5-Element Optical System
The Binorum Super Plössl 7.5mm represents an evolution beyond conventional eyepiece designs. With its 50° apparent field of view and advanced 5-element optical configuration, this eyepiece delivers universal compatibility across all telescope types - from compact refractors to large aperture reflectors and catadioptric systems. The Super Plössl architecture builds upon decades of proven optical engineering while incorporating modern refinements that elevate performance beyond traditional 4-element designs.
Optimized for Visual Excellence
What sets these modern Super Plössl eyepieces apart is their remarkable optical performance. Engineered specifically for observing the Moon and planets, they demonstrate extraordinary brightness coupled with faithful color reproduction that brings celestial targets to life. However, their versatility extends well beyond solar system objects - the optical quality makes them equally capable for viewing a diverse range of astronomical targets including globular clusters, double stars, and planetary nebulae.
Precision Optical Enhancements
Every Super Plössl eyepiece in the Binorum series incorporates carefully engineered features to maximize image quality. The lens edges feature professional-grade blackening treatment, effectively eliminating stray reflections that can compromise contrast when observing bright objects. All optical surfaces receive FMC (Fully Multi-Coated) treatment with specialized multi-layer coatings that ensure superior light transmission, razor-sharp image definition, and accurate color fidelity. Protective rubber eyecups fold down to block ambient light intrusion, preserving image contrast even in challenging observing environments.
The Versatile 7.5mm Focal Length
At 7.5mm focal length, this eyepiece occupies a strategic position in the medium-high magnification range, offering exceptional flexibility for various observing programs. When paired with a 750mm focal length telescope, it provides 100x magnification - an ideal power for detailed lunar exploration and comprehensive planetary observation. With longer focal length instruments such as a 1500mm Schmidt-Cassegrain, you achieve 200x magnification, perfect for resolving fine planetary atmospheric features and separating challenging double star systems.
This focal length strikes an excellent balance, delivering sufficient magnification for serious planetary work while maintaining comfortable eye relief compared to shorter focal length eyepieces. The moderate power level also makes it more forgiving of atmospheric turbulence, allowing productive observing sessions even when seeing conditions are less than perfect.
Technical Specifications
- Focal length: 7.5mm
- Apparent field of view: 50°
- Barrel size: 1.25″ (31.7mm) standard
- Optical configuration: 5-element Super Plössl
- Coating: FMC on all air-to-glass surfaces
- Eye relief: Approximately 6mm
- Optical edge treatment: Blackened
- Filter threads: Standard 1.25″
- Construction: Precision-machined metal housing
- Eyecup: Soft rubber, fold-down design
Comprehensive Focal Length Series
The Super Plössl line encompasses an extensive range of focal lengths: 6mm, 6.4mm, 7.5mm, 8mm, 10mm, 12mm, 12.5mm, 15mm, 17mm, 18mm, 20mm, 25mm, 32mm, and 40mm. This comprehensive selection enables astronomers to assemble a perfectly matched eyepiece collection tailored to their specific telescope and observing interests, with optimal magnification intervals across the entire useful range.
Practical Observing Applications
The 7.5mm Super Plössl excels across multiple astronomical disciplines. For lunar observers, it reveals intricate crater terracing, rugged mountain ranges, and delicate rille systems with impressive clarity. Planetary enthusiasts will appreciate its ability to showcase Jupiter's atmospheric belt structures, Saturn's ring divisions, and Martian albedo features during favorable oppositions. The eyepiece also performs admirably on compact deep-sky objects, resolving individual stars in globular cluster cores and revealing structural details in planetary nebulae.
Enhanced Contrast Performance
The combination of blackened lens edges and premium FMC coatings works synergistically to deliver exceptional contrast - a critical factor when observing subtle low-contrast features on planetary surfaces or detecting faint nebulosity adjacent to bright stars. This attention to contrast optimization ensures that you see the maximum detail your telescope's aperture can resolve.
Why Choose Binorum Eyepieces
Binorum Super Plössl eyepieces deliver professional-level optical performance at prices that make building a comprehensive eyepiece collection accessible. The 5-element optical design, full multi-coating treatment, and precision blackened edges represent features typically reserved for premium eyepiece lines. Rigorous manufacturing quality control ensures reliable performance, while the all-metal construction guarantees durability for years of astronomical exploration. Binorum has established a reputation for democratizing access to quality astronomical optics, enabling observers at every skill level to experience the universe with clarity and precision.
