OTA · 1978–
Celestron C90 (Maksutov)
Key specifications
| Aperture | 90 mm |
|---|---|
| Focal length | 1000 mm |
| Focal ratio | f/11 |
| Optical design | Maksutov-Cassegrain |
About
Vintage Celestron 3.5" maksutov-cassegrain (1000mm f/11). Original USA-made 90mm Maksutov-Cassegrain (late 1970s), sold as a compact spotting/astro scope. The post-1990s Chinese C90 shares only the name and configuration.