Celestron SkyMaster 15x70 Porro Prism Binoculars — A popular 15×70 Porro binocular for astronomy and long-range viewing, combining large 70mm objectives with a 4.4° field and a supplied tripod adapter.
Large-Aperture Views at 15×
The 70mm objectives gather light for views of the Moon, star clusters, brighter nebulae and wide celestial regions. The 15× magnification also suits long-distance terrestrial observation, with 18mm eye relief for a more comfortable viewing position.
Optical Design and Focusing
BaK-4 prisms and multi-coated optics help preserve image brightness and contrast. Centre focusing and a right-eyepiece dioptre allow quick adjustment between targets and compensation for differences between the eyes.
The published field of view is 4.4°, equivalent to 77m at 1,000m. Close focus is 13m (43ft), so this model is intended primarily for medium- to long-distance subjects.
Tripod Use and Weather Protection
A binocular tripod adapter is included. Although short handheld sessions are possible, the 1.361kg weight and 15× magnification make a suitably rated tripod strongly recommended for stable astronomical viewing. The tripod itself is not included.
Weather protection: Water resistant. It is not nitrogen filled and should not be treated as fully waterproof.
What Is Included?
- SkyMaster 15x70 binoculars
- Binocular tripod adapter
- 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 | 15× |
| Objective diameter | 70mm |
| Objective focal length | 279.63mm |
| Angular field of view | 4.4° |
| Linear field of view | 77m at 1,000m |
| Exit pupil | 4.7mm |
| Eye relief | 18mm |
| Close focus | 13m (43ft) |
| 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 | 32.4 |
| Relative brightness | 22.09 |
| Limiting stellar magnitude | 11.73 ideal; 10.73 moderate; 9.73 poor conditions |
Construction and Size
| Weather resistance | Water resistant |
|---|---|
| Nitrogen filled | No |
| Tripod mounting | Tripod adaptable; tripod adapter included |
| Carrying case | Nylon carrying case |
| Dimensions | 220 × 110 × 280mm (8.7 × 4.3 × 11 inches) |
| Binocular weight | 1.361kg (48oz) |
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.