Binorum Super Plössl 12.5mm 50° SPL 1.25″ Telescope Eyepiece
Bridging the Magnification Gap
The Super Plössl construction featuring a 50° apparent field offers practical everyday functionality - compatible with every telescope design. Binorum's Super Plössl eyepieces represent evolved Plössl optics with outstanding performance capabilities that transform visual observation. The 12.5mm focal length fills a valuable niche in eyepiece collections, providing magnification that bridges the gap between wide-field survey views and high-power detailed study.
Optimized for Lunar and Planetary Work
These eyepieces deliver ideal performance for Moon and planet observation, where optical quality directly impacts the details you can discern. Characterized by exceptional brightness and superior color accuracy, they adapt seamlessly to other celestial targets as well. The 12.5mm focal length provides just enough magnification to reveal planetary atmospheric features and lunar geological structures while maintaining sufficient field width to keep subjects comfortably framed during Earth's rotation.
Advanced Optical Technology
Lens edges throughout these Super Plössl eyepieces receive professional blackening treatment to ensure maximum contrast and eliminate stray reflections. Specialized FMC (Fully Multi-Coated) multi-layer coatings applied to every optical surface deliver superior light transmission efficiency, crisp image sharpness, and faithful color reproduction. These precision coatings reduce light scatter and internal reflections, allowing faint details to emerge against darker backgrounds. Fold-down rubber eyecups block peripheral light contamination while accommodating observers with or without eyeglasses.
Strategic Focal Length Selection
The 12.5mm focal length occupies a carefully chosen position in the magnification spectrum. With an 875mm telescope, it produces 70x magnification - excellent for scanning the lunar terminator where shadows reveal dramatic topography. On a 1000mm instrument, you reach 80x magnification, providing strong enough power for planetary detail while remaining usable even when atmospheric seeing conditions are less than ideal. For 1250mm focal length telescopes, this eyepiece delivers exactly 100x - a classic magnification that represents excellent all-around performance.
Technical Specifications
- Focal length: 12.5mm
- Apparent field of view: 50°
- Barrel diameter: 1.25″ (31.7mm)
- Optical design: 5-element Super Plössl
- Coatings: FMC (Fully Multi-Coated) on all air-to-glass surfaces
- Eye relief: 8mm
- Lens edge treatment: Professional blackening
- Filter threads: Standard 1.25″
- Housing: All-metal precision construction
- Eyecup: Soft rubber, fold-down
Complete Focal Length Range Available
The Super Plössl series encompasses a wide focal length selection: 6mm, 6.4mm, 7.5mm, 8mm, 10mm, 12mm, 12.5mm, 15mm, 17mm, 18mm, 20mm, 25mm, 32mm, and 40mm. This comprehensive range allows astronomers to build properly spaced eyepiece collections optimized for their specific telescopes and observing preferences.
Practical Observing Scenarios
The 12.5mm focal length handles diverse observing programs effectively. When exploring the Moon, it reveals intricate details within major craters including central peaks, terraced walls, and floor fractures, while keeping enough lunar surface visible to appreciate regional geology. For planetary observation, Jupiter's major cloud belts become distinct with visible turbulence along their boundaries, Saturn's Cassini Division appears clearly defined, and Mars shows albedo markings during favorable apparitions. The eyepiece also serves well for bright deep-sky objects including the Orion Nebula's core region, resolved outer portions of globular clusters, and compact open star clusters.
Building a Balanced Eyepiece Set
In a well-planned three-eyepiece collection, the 12.5mm focal length often serves as the medium-power workhorse positioned between a 20-25mm wide-field eyepiece and a 6-8mm high-power planetary eyepiece. This arrangement provides appropriate magnification steps without excessive gaps, ensuring you always have an eyepiece suited to current observing conditions and target requirements.
Enhanced Contrast Performance
The combination of blackened lens edges and comprehensive FMC coatings works synergistically to maximize image contrast - particularly important when observing low-contrast features like Jupiter's festoons, subtle lunar maria boundaries, or faint nebulosity surrounding bright stars. Superior contrast allows these details to emerge more readily, improving your ability to study celestial phenomena.
Comfortable Extended Viewing
With approximately 8mm of eye relief, the 12.5mm Super Plössl provides comfortable viewing for most observers without requiring precise eye positioning. The generous eye relief reduces eye fatigue during marathon observing sessions, while the rubber eyecup helps maintain proper eye placement naturally. This comfort factor becomes increasingly important during extended planetary observation programs or detailed lunar mapping projects.
Why Choose Binorum Eyepieces
Binorum Super Plössl eyepieces deliver professional optical performance through advanced 5-element designs, complete FMC coating systems, and precision manufacturing. The blackened lens edges represent attention to optical refinement typically found only in premium eyepiece lines. Consistent quality control ensures reliable performance across the entire product range, while robust all-metal construction provides long-term durability. Binorum combines optical excellence with accessible pricing, enabling astronomers at every level to experience the performance advantages of properly engineered eyepieces.
