Sky-Watcher K100 Klevtsov-Cassegrain Optical Tube Assembly
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The Sky-Watcher K100 Klevtsov-Cassegrain is a 100mm catadioptric optical tube built around a 1000mm focal length at f10. It folds a long optical path into a short, easily handled tube, making it well suited to high-magnification viewing of the Moon, bright planets, and close double stars. The mirror-based design stays well-balanced on light mounts while keeping contrast high and the setup straightforward.
Sky-Watcher K100 Klevtsov-Cassegrain Optical Tube Assembly Key Features:
- Compact 100mm catadioptric optical tube for lunar and planetary observing
- 1000mm focal length delivers high magnification with modest eyepieces
- RAQ-coated primary and secondary mirrors give bright, contrast-rich views
- Dual-knob friction focuser moves primary mirror smoothly and precisely
- Focus distance scale speeds up focusing from near objects to infinity
- Supplied 10mm and 20mm eyepieces cover x50 and x100 magnifications
- 5x24 finder aids quick alignment on bright targets
- 90° star diagonal supports comfortable visual observing
- Side-mounted dovetail with tripod thread fits light mounts and tripods
- Smartphone adaptor enables basic lunar and planetary imaging
FAQs:
What type of observing is the K100 best suited to?
The K100 is designed primarily for high-magnification work. Its long focal length and compact optical layout make it well suited to observing lunar surface detail, bright planets like Jupiter and Saturn, and close double stars where contrast and image scale matter most.
How does the focusing system work in practice?
Focusing is achieved by moving the primary mirror using a friction-driven dual-knob system. It feels smooth and controlled, with the focus distance indicator helping you quickly reach the correct position before fine adjustment.
Can this telescope be used for astrophotography?
It includes a smartphone adaptor, which allows simple imaging of the Moon and bright planets through the eyepiece. While it is not designed for long-exposure deep-sky imaging, it works well for casual planetary and lunar capture.
What kind of mount is required for the K100 OTA?
The tube is light and compact, so it pairs comfortably with small equatorial or alt-azimuth mounts. The side-mounted dovetail bar and 1/4-20 tripod thread also allow it to be fitted to sturdy photographic tripods for visual use.
Product Specification
| Diagonal | 90° Star Diagonal (1.25”) |
| Diameter [mm] | 100.0 |
| Eyepiece 1 | 10mm |
| Eyepiece 2 | 20mm |
| Focal Length [mm] | 1000 |
| Highest Practical Magnification [x] | 200 |
| Included Accessories | Universal Smartphone Adaptor |
| Magnification With Eyepieces Supplied [x] | 50 and 100 |
| Optical Tube Length [mm] | 363 |
| Optical Tube Weight [kg] | 1.70 |