Details
The largest aperture scope in the Ultima line, the 100 mm Ultima offers more than 50% brighter images than the 80mm, allowing for better performance in low light conditions. The 100 mm refractor features excellent multi-coated optics packed into a portable and durable refractor design and comes standard with a 22-66x zoom eyepiece.
This series was designed to perform well in a range of viewing situations, making it a great all-around optical instrument. You’ll love it for observing nature and long distance spotting and since it is completely waterproof you can feel comfortable using it in extreme weather. The green rubber optical tube allows for subtle observation in any nature environment. Ultima spotters are a great companion for any nature or outdoor enthusiast. Soft carrying case included.
Additional Information
| Optical Design | Refractor |
|---|---|
| Aperture (mm) | 100 mm (3.94 in) |
| Focal Length (mm) | 540 mm (21 in) |
| Focal Ratio | 5.4 |
| Angle | 45 ° |
| Eyepiece 1 | 8-24 Zoom |
| Magnification 1 | 22-66x |
| Finderscope | Sighting tube |
| Other Equipment | Tripod Balancing Platform |
| Carrying Case | Soft Case |
| Highest Useful Magnification | 236 x |
| Lowest Useful Magnification | 14 x |
| Limiting Stellar Magnitude | 12.5 |
| Resolution (Rayleigh) | 1.39 arc seconds |
| Resolution (Dawes) | 1.16 arc seconds |
| Light Gathering Power | 204 x |
| Angular Field of View | 1.8° - 1° |
| Linear Field of View (@1000 yds) | 95ft @ 22x 53ft @ 66x |
| Eye Relief | 18 mm @ 22x |
| Near Focus | 33ft @ 23x |
| Optical Coatings | Multi-Coated |
| Optical Tube Length | 19 in (483 mm) |
| Weight (oz) | 72 oz (2041 g) |
| Camera Adaptable | Built-in T-thread on Eyepiece |
| Tripod Adaptable | Yes |
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Knowledge Base
- My Celestron Ultima and Regal spotting scopes have threads in front of the objectives. What sizes of photo filters do they use?
- What is a waterproof spotting scope?
- I have an old Celestron spotting scope and have lost the cover for the lens. The scope is 100mm and about 10 years old. How do I get a replacement cap?
- What is seeing? Does it affect terrestrial viewing? How does it affect my target spotting, bird watching and surveillance?
- My Ultima spotting scope zoom eyepiece isn't threading on the scope. What's wrong?
Downloads
Manuals
Ultima Series Manual (English, German, French, Spanish & Italian) (257.25 KB | PDF)
