Celestron SkyMaster Pro 20x80 Porro Prism Binoculars — A heavy-duty 20×80 Porro binocular for detailed astronomical and long-distance observation, with XLT fully multi-coated optics, waterproof nitrogen-filled construction and a built-in sliding tripod adapter.
High-Power 80mm Astronomy Binoculars
The 80mm objectives gather substantial light for lunar detail, star clusters, brighter nebulae and long-range terrestrial subjects. The 20× magnification and 3.2° field make stable support important for accurate aiming and comfortable viewing.
XLT Fully Multi-Coated Optics
Every air-to-glass surface uses Celestron’s proprietary XLT multi-coating system. Combined with BaK-4 Porro prisms, these coatings are designed to increase light transmission and deliver crisp, high-contrast views.
Centre focusing adjusts both barrels, while the right-eyepiece dioptre compensates for differences between the user’s eyes. The supplied standard eyecups can be exchanged for winged eyecups when additional protection from stray light is helpful.
Waterproof and Nitrogen Filled
The rubber-armoured polycarbonate and aluminium housing is waterproof and filled with dry nitrogen gas to reduce internal fogging when the binocular moves between temperature extremes or is used in damp conditions.
Waterproof construction improves protection during normal outdoor use but does not make the binocular suitable for immersion or careless storage while wet.
Tripod Mounting and Reflex Sight Ready Rail
The built-in tripod adapter slides along the central support rod so the binocular can be balanced on a suitable tripod and head. At 2.449kg and 20× magnification, tripod use should be treated as normal operation. A tripod is sold separately.
The included detachable Reflex Sight Ready rail accepts a compatible optional red-dot finderscope, helping the user locate and centre distant objects more quickly. The red-dot finder is not included.
What Is Included?
- SkyMaster Pro 20x80 binoculars
- Integrated sliding tripod adapter and balance rail
- Detachable Reflex Sight Ready rail
- Standard fold-down eyecups
- Interchangeable winged eyecups
- Objective lens caps
- Eyepiece rainguard
- Neck strap
- Deluxe nylon carrying case
- Lens-cleaning cloth
- Five-language instruction manual
Please note: A tripod, red-dot finderscope, solar filters and any item not listed above are not stated as included.
Specifications
Optics
| Optical design | Porro prism binocular |
|---|---|
| Magnification | 20× |
| Objective diameter | 80mm |
| Objective focal length | 329.15mm |
| Angular field of view | 3.2° |
| Linear field of view | 56m at 1,000m |
| Exit pupil | 4mm |
| Eye relief | 15.5mm |
| Close focus | 20.2m (66.2ft) |
| Interpupillary distance | 56–72mm |
| Dioptre adjustment | ±4 |
| Focusing system | Centre focus with right-eyepiece dioptre |
| Lens coatings | Fully multi-coated with Celestron XLT coatings |
| Prism glass | BaK-4 |
| Twilight factor | 40 |
| Relative brightness | 16 |
| Limiting stellar magnitude | 12.02 ideal; 11.02 moderate; 10.02 poor conditions |
Construction and Size
| Environmental protection | Waterproof |
|---|---|
| Nitrogen filled | Yes |
| Tripod mounting | Integrated sliding tripod adapter on centre support rod |
| Reflex-sight rail | Detachable Reflex Sight Ready rail included; red-dot finderscope sold separately |
| Carrying case | Deluxe nylon carrying case |
| Dimensions | 330.2 × 241.3 × 101.6mm (13 × 9.5 × 4 inches) |
| Binocular weight | 2.449kg (86.4oz) |
Solar Safety
Warning: Never look at or near the Sun through these binoculars.
These are not solar binoculars and do not include certified solar filters. Direct or nearby views of the Sun can cause immediate and permanent eye injury.
Do not attempt solar projection and do not attach improvised or eyepiece-mounted filters.
Instruction Manual
The official SkyMaster Pro instruction manual covers both models and is provided in English, French, Spanish, German and Italian.