Binorum Planetary Pro 3.2mm 58° 1.25″ Premium Planetary Eyepiece
Advanced 6-element optical design delivering exceptional planetary performance with remarkably long eye relief. The Binorum Planetary Pro 3.2mm represents a significant advancement over traditional Plössl designs, offering the sharpness and contrast of premium orthoscopic eyepieces combined with a generous 58° apparent field of view. This sophisticated eyepiece is engineered specifically for demanding planetary and lunar observers who refuse to compromise on optical quality.
Revolutionary Eye Relief for Ultra-Short Focal Length
The standout feature of the Planetary Pro series is its surprisingly long eye relief – a remarkable achievement for such a short focal length eyepiece. Unlike traditional 3-4mm Plössl eyepieces that force you to press your eye uncomfortably close to the lens, the Planetary Pro 3.2mm provides generous eye relief that allows comfortable viewing even for eyeglass wearers. This makes high-magnification planetary observation accessible to observers who must wear glasses for astigmatism correction, eliminating a significant barrier that has traditionally limited ultra-short focal length eyepiece usage.
Superior Optical Performance
The 6-element optical design delivers razor-sharp views with exceptional contrast across the entire 58° field of view. This wider field compared to traditional Plössl eyepieces (typically 43-52°) makes planetary tracking easier and more comfortable, while the sophisticated optical formula ensures that edge performance rivals center sharpness. You'll notice immediately that stars remain pinpoint across the field, and planetary limbs stay crisp right to the edge.
Complete elimination of lateral color aberration and stray light sets the Planetary Pro apart from conventional designs. While budget eyepieces may show colored fringes on high-contrast planetary features like Jupiter's limb or Saturn's rings, the Planetary Pro maintains perfect color fidelity. This purity is crucial when studying subtle planetary atmospheric phenomena, where false colors would obscure genuine features.
Advanced Anti-Reflection Engineering
Every air-to-glass surface features multiple layers of broadband anti-reflection coating, maximizing light transmission and ensuring that fine details on the Moon and planets display with crisp, high-contrast clarity. These premium coatings work in concert with the sophisticated internal light management system.
The entire interior of the eyepiece barrel is blackened, and all internal baffles incorporate edge-mounted anti-reflection micro-dampeners with comprehensive black anodizing to reduce reflections. This meticulous attention to stray light suppression ensures that even when observing bright objects like the Moon or Venus, ghost images and internal reflections are completely eliminated. The result is inky-black backgrounds that make planetary details pop with stunning three-dimensional clarity.
Premium Mechanical Design
The threaded eyecup can be raised or lowered to precisely match your preferred eye relief distance, providing customized comfort for extended observing sessions. Each eyepiece features a flexible fold-down rubber eye guard that shields your eye from peripheral light while remaining comfortable during long viewing periods. This thoughtful design allows you to find your optimal viewing position and maintain it consistently night after night.
The robust metal barrel construction ensures years of reliable service, while the standard 1.25″ diameter provides universal compatibility with all modern focusers and diagonals. Filter threads allow you to enhance planetary contrast with color filters or reduce light pollution with specialized filters.
Versatile Applications
The Binorum Planetary Pro 3.2mm excels across a wide range of astronomical applications:
- Planetary Observation: Reveals the finest atmospheric details on Jupiter, Saturn, Mars, and Venus. Perfect for studying Jupiter's Great Red Spot, Saturn's atmospheric bands and ring divisions, Mars' polar caps and albedo features, and Venus' atmospheric patterns
- Lunar Exploration: Exceptional for examining crater fine structure, central peaks, terraced walls, rilles, wrinkle ridges, and volcanic domes. The high contrast reveals subtle albedo variations and allows detailed study of the lunar terminator
- Deep-Sky Objects: Ideal for planetary nebulae like the Ring Nebula (M57), Blinking Planetary (NGC 6826), and the Cat's Eye Nebula (NGC 6543). Also excellent for resolving stars in globular clusters and examining galactic nuclei
- Double Stars: Provides the magnification necessary to cleanly split tight binary systems and reveal color contrasts between stellar companions. Essential tool for double star observers and those testing telescope optical quality
- Astrophotography Projection: The eyepiece's optical quality makes it suitable for eyepiece projection photography with DSLR cameras or compact cameras, allowing you to capture high-resolution planetary images
Magnification Examples
Calculate magnification by dividing your telescope's focal length by 3.2mm:
- 600mm telescope = 188x magnification
- 700mm telescope = 219x magnification
- 900mm telescope = 281x magnification
- 1000mm telescope = 313x magnification
- 1200mm telescope = 375x magnification
- 1500mm telescope = 469x magnification
- 2000mm telescope = 625x magnification
These extreme magnifications approach or exceed most telescopes' maximum useful magnification. Use this eyepiece when atmospheric seeing is excellent and your telescope is properly collimated and thermally acclimated.
Technical Specifications
| Model |
Binorum Planetary Pro 3.2mm |
| Optical Design |
6-element advanced planetary design |
| Focal Length |
3.2 mm |
| Apparent Field of View |
58° |
| Barrel Diameter |
1.25″ (31.7 mm) |
| Eye Relief |
Long eye relief (suitable for eyeglass wearers) |
| Optical Coatings |
Fully multi-coated broadband anti-reflection coatings on all air-to-glass surfaces |
| Internal Treatment |
Complete blackening with anti-reflection micro-dampeners and black anodizing |
| Eyecup |
Threaded twist-up/down eyecup with flexible rubber eye guard |
| Barrel Threading |
Standard filter threads (M28.5 x 0.6) |
| Housing Material |
Premium metal barrel construction |
| Color Correction |
No lateral color aberration |
| Contrast |
Exceptional high-contrast performance |
| Best For |
High-power planetary/lunar observation, double stars, planetary nebulae, astrophotography projection |
| Eyeglass Compatibility |
Yes – long eye relief accommodates eyeglass wearers |
| Compatible With |
All telescopes with 1.25″ focusers |
Advantages Over Traditional Plössl Designs
While Plössl eyepieces have served amateur astronomers well for decades, the Planetary Pro series represents a quantum leap forward in several critical areas:
- Wider Field of View: 58° vs. typical 43-52° for Plössl designs, making planetary tracking significantly easier
- Superior Eye Relief: Dramatically longer eye relief compared to short-focal-length Plössl eyepieces, enabling comfortable viewing and eyeglass compatibility
- Enhanced Contrast: Advanced internal baffling and anti-reflection treatments exceed standard Plössl performance
- Better Edge Performance: 6-element design maintains sharpness across the entire field, while 4-element Plössl designs may show edge softening
- No Lateral Color: Complete elimination of color fringing that can appear in simpler designs
- Astrophotography Ready: Optical quality suitable for demanding eyepiece projection photography
Optimal Viewing Conditions
To extract maximum performance from this premium eyepiece:
- Observe when atmospheric seeing is excellent – look for steady, calm nights with minimal turbulence
- Allow adequate thermal stabilization time (30-120 minutes depending on telescope type and size)
- Ensure precise collimation of your telescope's optical system
- Observe targets when they're high in the sky to minimize atmospheric distortion
- Use the adjustable eyecup to find your optimal eye position and maintain consistent placement
- Consider using planetary color filters to enhance specific atmospheric features
Telescope Compatibility and Recommendations
While universally compatible with 1.25″ focusers, this eyepiece performs best with:
- Telescopes with excellent optical quality and minimal aberrations
- Apertures of 100mm (4") or larger to support extreme magnifications
- Focal lengths from 700mm to 2000mm for optimal magnification range
- Well-collimated reflectors or high-quality refractors and catadioptric telescopes
- Stable mounts capable of tracking at high magnifications
Astrophotography Projection
The Planetary Pro's exceptional optical quality makes it an excellent choice for eyepiece projection astrophotography. When used with a DSLR camera or planetary imaging camera, this eyepiece can project highly magnified, sharp images onto your sensor. The long eye relief provides adequate working distance for camera adapters, and the superior contrast and color correction ensure that your captured images rival those taken with dedicated imaging systems.
The complete absence of stray light and ghost images is particularly important for astrophotography, where long exposures can reveal imperfections invisible to the eye. The Planetary Pro's meticulous internal light management ensures clean, artifact-free planetary images.
Building a Premium Eyepiece Collection
The Planetary Pro 3.2mm represents the extreme high-power end of a versatile eyepiece collection. Complement it with:
- Medium-power eyepieces (8-15mm) for general planetary observation and initial targeting
- Low-power wide-field eyepieces (20-32mm) for finding objects and sweeping star fields
- Specialized filters to enhance planetary contrast and detail
- A quality Barlow lens to create intermediate focal lengths from your existing eyepieces
Investment in Excellence
The Binorum Planetary Pro series represents a significant investment in optical quality, but one that delivers returns every clear night. The combination of advanced 6-element optics, long eye relief, wide field of view, and meticulous anti-reflection engineering creates an eyepiece that will serve you for decades of astronomical observation.
For serious planetary observers, lunar enthusiasts, double star aficionados, and astrophotographers who demand the finest optical performance, the Planetary Pro 3.2mm eliminates the compromises inherent in traditional ultra-short focal length designs. The ability to use this eyepiece comfortably with eyeglasses opens high-magnification astronomy to observers who were previously limited by short eye relief.
Why Choose Binorum Planetary Pro 3.2mm?
This eyepiece is designed for discerning observers who understand that exceptional optics make the difference between seeing planetary features and truly studying them. It's for the dedicated amateur astronomer who tracks Jupiter's atmospheric changes throughout the apparition, the lunar observer who maps fine crater details, the double star enthusiast who seeks to resolve the tightest pairs, and the astrophotographer who demands optical perfection.
The Planetary Pro 3.2mm combines cutting-edge optical design with practical mechanical features to create an eyepiece that performs flawlessly in real-world observing conditions. From the long eye relief that accommodates eyeglass wearers to the twist-up eyecup that ensures consistent eye positioning, every detail has been engineered with the observer's experience in mind.
Experience planetary observation at its finest – the Binorum Planetary Pro 3.2mm eyepiece reveals the universe with unprecedented clarity, contrast, and comfort.
