Celestron SkyMaster 20x80 Porro Prism Binoculars — A substantial 20×80 astronomy binocular with large objectives, an integrated tripod adapter rod and 18mm eye relief for bright, stable views from a suitable support.
80mm Light Gathering for Astronomy
The 80mm objectives increase light gathering for star clusters, nebulae, the Moon and other bright deep-sky subjects, while 20× magnification brings out more detail than lower-power handheld binoculars. The 3.7° field remains useful for exploring larger sky regions.
Optical Design and Focusing
BaK-4 prisms and multi-coated optics support image brightness and contrast. Centre focusing with a right-eyepiece dioptre provides straightforward adjustment, while the 4mm exit pupil offers a practical balance between magnification and image brightness.
The published field of view is 3.7°, equivalent to 65m at 1,000m. Close focus is 33m (108ft), so this model is intended primarily for medium- to long-distance subjects.
Tripod Use and Weather Protection
The built-in tripod adapter rod slides to help balance the binocular on a suitably rated photographic or astronomical tripod. At 2.126kg and 20× magnification, tripod use should be treated as normal operation. A tripod is not included.
Weather protection: Water resistant. It is not nitrogen filled and should not be treated as fully waterproof.
What Is Included?
- SkyMaster 20x80 binoculars
- Integrated sliding tripod adapter rod
- Objective lens caps
- Eyepiece rainguard
- Neck strap
- Nylon carrying case
- Lens-cleaning cloth
- Five-language SkyMaster instruction manual
Please note: A tripod, 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 | 328.6mm |
| Angular field of view | 3.7° |
| Linear field of view | 65m at 1,000m |
| Exit pupil | 4mm |
| Eye relief | 18mm |
| Close focus | 33m (108ft) |
| Interpupillary distance | 56–72mm |
| Dioptre adjustment | -4 to +8 |
| Focusing system | Centre focus with right-eyepiece dioptre |
| Optical coatings | Multi-coated |
| 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
| Weather resistance | Water resistant |
|---|---|
| Nitrogen filled | No |
| Tripod mounting | Integrated tripod adapter rod; tripod sold separately |
| Carrying case | Nylon carrying case |
| Dimensions | 228 × 120 × 325mm (9 × 4.7 × 12.8 inches) |
| Binocular weight | 2.126kg (75oz) |
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 Celestron documentation is provided in English, French, German, Italian and Spanish.