Binorum Super Plössl 17mm 50° SPL 1.25″ Planetary Eyepiece
The Binorum Super Plössl 17mm eyepiece represents a modern evolution of the classic Plössl design, delivering exceptional optical performance for universal astronomical applications. With its 50° apparent field of view and versatile focal length, this eyepiece serves as an ideal all-purpose addition to any telescope, from compact refractors to large Dobsonians.
Superior Optical Design
The Super Plössl configuration employs a four-element optical design that provides excellent correction for common aberrations while maintaining high light transmission. This proven architecture delivers sharp, high-contrast images across the entire field of view, making it particularly well-suited for observing fine details on the Moon and planets.
The 17mm focal length offers a balanced magnification that works effectively across a wide range of telescope types. It provides comfortable eye relief and a generous exit pupil, ensuring relaxed viewing sessions even during extended observations. This focal length is particularly valuable for observing lunar features, planetary details, and brighter deep-sky objects like star clusters and nebulae.
Professional-Grade Coatings
Every optical surface features special FMC (Fully Multi-Coated) treatment, ensuring maximum light transmission and minimal internal reflections. This advanced coating technology delivers several critical benefits: excellent image sharpness, accurate color rendition, and improved contrast. The multi-layer coatings are particularly effective at reducing ghosting and flare when observing bright objects like the Moon or planets near the horizon.
The lens edges have been professionally blackened to eliminate internal reflections and stray light, further enhancing contrast. This attention to detail ensures that subtle planetary features and delicate lunar shadows remain visible even under less-than-ideal observing conditions.
Brightness and Color Fidelity
The eyepiece excels in brightness and color rendition, characteristics essential for planetary observation where accurate color perception helps distinguish atmospheric features. On Jupiter, this means clearer differentiation between the planet's various cloud belts and zones. On Saturn, it reveals subtle color variations in the rings and atmospheric bands. The Moon's varied terrain - from bright highlands to dark maria - displays with natural contrast and detail.
While optimized for lunar and planetary work, the eyepiece's optical quality makes it equally capable for other celestial targets. Globular clusters resolve into pinpoint stars, while nebulae display their delicate structures with good contrast.
Comfortable Viewing Experience
Rubber fold-down eyecups provide effective protection from stray light while offering comfort during extended observing sessions. The eyecups can be folded down for eyeglass wearers or raised for those observing without glasses, accommodating different viewing preferences. The standard 1.25″ barrel fits all common telescope focusers and diagonal prisms.
Complete Focal Length Range
This eyepiece is part of an extensive Super Plössl series offering focal lengths from 6mm to 40mm: 6mm, 6.4mm, 7.5mm, 8mm, 10mm, 12mm, 12.5mm, 15mm, 17mm, 18mm, 20mm, 25mm, 32mm, and 40mm. This comprehensive range allows you to build a coordinated eyepiece collection matched to your telescope's capabilities and your observing interests.
Why Choose Binorum
Binorum eyepieces combine classical optical designs with modern manufacturing precision and coating technology. Each eyepiece undergoes strict quality control to ensure consistent performance and durability. With Binorum, you receive reliable optical equipment that delivers sharp, high-contrast views year after year, allowing you to focus on exploring the cosmos rather than managing equipment issues.
