Celestron SkyMaster Pro ED 20x80 Porro Prism Binoculars — Heavy-duty 20×80 astronomy binoculars with extra-low dispersion objectives, XLT fully multi-coated optics and an integrated sliding tripod adapter for stable, high-resolution viewing.
High-Power 20×80 Astronomy Binoculars
The 80mm objectives and 20× magnification reveal fine lunar detail, dense star fields, star clusters and brighter deep-sky objects. The 3.4° field provides a focused high-power view while retaining enough sky for practical target framing.
ED Glass and XLT Fully Multi-Coated Optics
Extra-low dispersion objective glass reduces chromatic aberration so bright objects show less colour fringing, with improved contrast, colour fidelity and fine detail. BaK-4 Porro prisms and Celestron's XLT fully multi-coated optical surfaces support bright, high-contrast views across the optical path.
The widely spaced Porro objectives also enhance depth perception for terrestrial viewing.
Comfortable Centre Focusing
A central focus wheel adjusts both barrels, while the right-eyepiece dioptre provides ±3 compensation for differences between the user's eyes. Padded twist-up eyecups offer retracted, intermediate and extended positions for viewing with or without spectacles.
Each eyepiece is threaded for compatible standard 1.25-inch astronomical filters. Filters are optional and are not included. Never use these threads with solar eyepiece filters.
IPX7 Waterproof and Nitrogen Filled
The rubber-armoured housing is rated waterproof to IPX7 and filled with dry nitrogen gas to help prevent internal fogging. Keep the binocular clean and dry after use and replace all lens caps before storage.
Tripod Mounting
The built-in tripod adapter slides along the centre support rod to help balance the binocular on a suitable tripod head. At 3.492kg and 20× magnification, tripod use should be treated as normal operation. A tripod is sold separately.
What Is Included?
- SkyMaster Pro ED 20x80 binoculars
- Objective lens caps
- Eyepiece covers / rainguard
- Neck strap
- Lens cloth
- Non-silica desiccant
- Deluxe nylon carrying case
- Five-language instruction manual
Please note: A tripod, optional astronomy filters and any item not listed above are not stated as included. The tripod adapter is built into this model.
Specifications
Optics and Viewing
| Optical design | Porro prism binocular with ED objective lenses |
|---|---|
| Magnification | 20× |
| Objective diameter | 80mm |
| Angular field of view | 3.4° |
| Linear field of view | 59m at 1,000m (178ft at 1,000yd) |
| Exit pupil | 4.0mm |
| Eye relief | 15.4mm |
| Close focus | 30m (98.4ft) |
| Interpupillary distance | 56–72mm |
| Dioptre adjustment | ±3 |
| 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 |
| Eyepiece filter compatibility | Standard threaded 1.25-inch astronomical filters; filters not included |
Construction and Size
| Environmental protection | Waterproof (IPX7) |
|---|---|
| Nitrogen filled | Yes |
| Tripod mounting | Built-in sliding tripod adapter on centre support rod with ¼-20 mounting thread |
| Carrying case | Deluxe nylon carrying case |
| Dimensions | 335 × 230 × 94mm (13.2 × 9.1 × 3.7 inches) |
| Published binocular weight | 3.492kg (123.2oz) |
Solar Safety
Warning: Never look directly at or near the Sun through these binoculars.
These are not solar binoculars. Unfiltered sunlight can cause immediate and permanent eye injury and may damage the binoculars.
Never project an image of the Sun and never attach an eyepiece-type solar filter.
Instruction Manual
The official SkyMaster Pro ED instruction manual covers items 72033, 72034 and 72035 and is provided in English, French, German, Italian and Spanish.