Binorum Super Plössl 6.4mm 50° SPL 1.25″ Eyepiece
Enhanced Plössl Design for Superior Performance
The Super Plössl eyepiece design with a 50° field of view represents the next evolution of the classic Plössl configuration - suitable for every telescope. Super Plössl eyepieces are modern Plössl eyepieces with outstanding optical performance that surpass standard 4-element Plössls through the addition of a fifth optical element, delivering enhanced edge correction and improved contrast across the entire field of view.
Exceptional Optical Quality
These eyepieces are ideal for observing the Moon and planets, delivering performance that demanding observers expect. They are characterized by exceptional brightness and outstanding color rendition, so you can use them for other objects as well. The optical refinements in the Super Plössl design ensure that planetary cloud bands, lunar crater details, and surface features appear with natural colors and precise definition.
Advanced Optical Features
The lens edges of these Super Plössl eyepieces have been blackened to ensure good contrast and suppress internal reflections. Special FMC (Fully Multi-Coated) multi-layer coatings on all optical surfaces ensure excellent light transmission, image sharpness, and accurate color rendition. These premium coatings minimize light loss and ghosting, delivering maximum performance even when observing bright objects like the Moon or Venus.
Enhanced Viewing Comfort
Rubber fold-down eyecups protect against scattered light from the sides, maintaining image contrast even in less-than-ideal observing conditions. The eyecups can be folded down to accommodate eyeglass wearers or extended for comfortable eye positioning during extended planetary observation sessions.
Technical Specifications
- Focal length: 6.4mm
- Apparent field of view: 50°
- Barrel diameter: 1.25″ (31.7mm)
- Optical design: 5-element Super Plössl configuration
- Lens coatings: FMC (Fully Multi-Coated) on all surfaces
- Eye relief: Approximately 4.8mm
- Lens edge treatment: Blackened to reduce stray light and reflections
- Filter threads: Standard 1.25″ threads
- Housing: All-metal construction
- Eyecup: Rubber fold-down design
High Magnification for Detailed Planetary Views
The short 6.4mm focal length is specifically designed for high-magnification planetary and lunar observation. When paired with a 640mm focal length telescope, this eyepiece delivers 100x magnification - perfect for general planetary viewing and detailed lunar work. With a 1000mm telescope, you achieve 156x magnification, excellent for resolving fine details on Jupiter's cloud belts, Saturn's ring system including the Cassini Division, and intricate lunar crater formations. At 1280mm focal length, you reach 200x magnification, ideal for high-resolution planetary observation during nights of excellent atmospheric stability.
Comprehensive Focal Length Range Available
The Super Plössl series offers a wide range of focal lengths to suit every observing need: 6mm, 6.4mm, 7.5mm, 8mm, 10mm, 12mm, 12.5mm, 15mm, 17mm, 18mm, 20mm, 25mm, 32mm, and 40mm. This comprehensive selection allows you to build a complete eyepiece set with optimal magnification steps for your telescope, ensuring you have the right tool for every observing scenario from wide-field star cluster viewing to high-resolution planetary work.
Optimal Use Cases
- High-resolution planetary observation - cloud belt details, Great Red Spot, polar regions
- Detailed lunar crater observation and rille systems
- Close double star separation (resolving pairs down to telescope's diffraction limit)
- Globular cluster core resolution and individual star identification
- Small planetary nebulae observation with structural details
- High-magnification work during excellent atmospheric conditions
Superior to Standard Plössl Design
The Super Plössl 5-element design offers several advantages over standard 4-element Plössls: improved edge sharpness with minimal aberrations, better color correction across the entire field, reduced internal reflections due to optimized element spacing, and enhanced contrast on low-contrast planetary features. While maintaining the proven optical formula that has made Plössl eyepieces popular for decades, the Super Plössl adds refinements that serious planetary observers appreciate.
Best Viewing Conditions
The high magnification provided by this 6.4mm eyepiece performs best under stable atmospheric conditions with good "seeing." On nights of excellent atmospheric stability, you'll be rewarded with stunning planetary details, the Cassini Division in Saturn's rings, and crisp lunar features down to the smallest craters your telescope can resolve. This eyepiece is most effective with telescopes of 4 inches (100mm) aperture or larger, where the optics can support the high magnification while maintaining adequate image brightness and resolution.
Versatile Magnification Range
The 6.4mm focal length occupies a strategic position in the high-magnification range, offering slightly lower magnification than a 6mm eyepiece while providing marginally better eye relief. This makes it more comfortable for extended observing sessions while still delivering the high magnification needed for planetary detail. The eyepiece works well across a broad range of telescope focal lengths, from short-tube refractors to long focal ratio Schmidt-Cassegrains.
Compatible with Planetary Filters
The integrated filter threads allow you to enhance planetary observation with standard color filters. Use a #80A blue filter to increase contrast on Jupiter and Saturn, revealing subtle belt structures and festoons. Apply a #21 orange or #23A light red filter to enhance Mars surface features including polar caps and albedo markings. A moon filter reduces glare when observing our natural satellite at high magnification. The blackened lens edges and FMC coatings work synergistically with filters to maintain maximum contrast and color fidelity.
Professional-Grade Construction
Despite its affordable pricing, the Binorum Super Plössl 6.4mm features all-metal construction that ensures precision and durability. The barrel is precisely machined to fit snugly in telescope focusers without play or wobbling, critical for maintaining sharp focus at high magnifications. The robust build quality ensures this eyepiece will provide years of reliable service under regular use, withstanding the rigors of frequent transport and setup.
Why Choose Binorum Eyepieces
Binorum Super Plössl eyepieces represent exceptional value in premium astronomical optics. The 5-element optical design, combined with FMC coatings on all surfaces and blackened lens edges, delivers performance characteristics typically found only in significantly more expensive eyepieces. Each eyepiece undergoes rigorous quality control testing to ensure consistent optical performance and mechanical precision across the product line. The comprehensive focal length range allows observers to build a complete, matched eyepiece set for optimal performance across all magnification ranges. Binorum's commitment to quality manufacturing and optical excellence has earned recognition among amateur astronomers worldwide, providing professional-grade performance at accessible prices and making high-quality planetary observation available to enthusiasts at all experience levels.
