Celestron SkyMaster 25x100 specs and field of view
The SkyMaster 25x100 carries a 100 mm objective in a 140 oz body, with a calculated twilight factor of 50 and a 156 ft field.
- Field of view
- 156 ftat 1,000 yd
- Eye relief
- 15 mm
- Close focus
- 80 ft
- Weight
- 140 oz
- Exit pupil
- 4 mmcalculated
Why pick it
- Takes a tripod adapter
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Who the SkyMaster 25x100 suits
For fixed astronomy mounts, the 15 mm eye relief and calculated 4 mm exit pupil suit deep sky targets. It sits in the $500 to $1,000 maker list price band.
At 140 oz it cannot be hand held, and the 80 ft close focus rules out anything but distant targets. The body is water resistant only.
SkyMaster 25x100 aside, the most popular models of all sizes are in our best binoculars comparison. Celestron lists it in the $500 to $1,000 price band, alongside the models in best binoculars under $1,000.
SkyMaster 25x100 specifications
SkyMaster 25x100 figures as Celestron prints them; rows marked * are calculated from the 25x100 size.
| Magnification | 25x |
|---|---|
| Objective lens | 100 mm |
| Prism type | Porro |
| Field of view | 156 ft at 1,000 yd (52 m at 1,000 m) |
| Angular field of view | 3° |
| Apparent field of view | 75° * |
| Eye relief | 15 mm |
| Close focus | 80 ft (24.4 m) |
| Eye spacing range | 56 to 72 mm |
| Weight | 140 oz (3,969 g) |
| Waterproofing | Water Resistant |
| Tripod adaptable | Yes |
| Maker list price | $500 to $1,000 |
| Exit pupil | 4 mm * |
| Twilight factor | 50 * |
| Relative brightness | 16 * |
* Calculated from the size, not printed by the maker.
Other sizes of the SkyMaster
Celestron makes the SkyMaster in 5 sizes; a larger front lens adds brightness and weight, and more magnification narrows the view.
| Model | Size | Field of view | Eye relief | Close focus | Weight | Exit pupil | Amazon |
|---|---|---|---|---|---|---|---|
| Celestron SkyMaster 25x100 | 25x100 | 156 ft | 15 mm | 80 ft | 140 oz | 4 mm | Check price on Amazon |
| Celestron SkyMaster 12x60 | 12x60 | 278 ft | 17 mm | 59 ft | 39.2 oz | 5 mm | Check price on Amazon |
| Celestron SkyMaster 15x70 | 15x70 | 231 ft | 18 mm | 43 ft | 48 oz | 4.7 mm | Check price on Amazon |
| Celestron SkyMaster 25x70 | 25x70 | 141 ft | 13 mm | 75 ft | 52 oz | 2.8 mm | Check price on Amazon |
| Celestron SkyMaster 20x80 | 20x80 | 195 ft | 18 mm | 108 ft | 75 oz | 4 mm | Check price on Amazon |
Lists that include the SkyMaster 25x100
Celestron binoculars
SkyMaster 25x100 questions
SkyMaster 25x100: does it work with glasses?
SkyMaster 25x100 has 15 mm of eye relief, under the 16 mm the RSPB advises for people who wear glasses, so the edge of the view may be cut off with glasses on.
SkyMaster 25x100: what does 25x100 mean?
SkyMaster 25x100 magnifies 25 times through 100 mm front lenses, which works out to an exit pupil of 4 mm, the width of the beam of light that reaches each eye.
SkyMaster 25x100: can it go on a tripod?
SkyMaster 25x100 is tripod adaptable according to Celestron, so it accepts a binocular tripod adapter.