Celestron Astro Fi 102 vs Celestron C5 optical tube: specs compared
Updated 05 September 2026.
127 mm
Celestron C5 optical tube wins on aperture
On aperture, Celestron C5 optical tube leads: 127 mm versus 102 mm.
| Spec | Celestron Astro Fi 102 | Celestron C5 optical tube |
|---|---|---|
| Aperture | 102 mm (4.02 in) | 127 mm (5 in) |
| Focal length | 1325 mm | 1250 mm |
| Focal ratio | f/13 | f/10 |
| Optical design | Maksutov-Cassegrain | Schmidt-Cassegrain |
| Focuser / eyepiece barrel | 1.25 in visual back | 1.25 in visual back (SCT rear cell) |
| Mount | Computerized altazimuth with WiFi (GoTo) | Optical tube only (Vixen dovetail), no mount supplied |
| Highest useful magnification (published) | 241x | 295x |
| Optical tube weight | 6 lb |
Questions and answers
Which has the higher aperture, Celestron Astro Fi 102 or Celestron C5 optical tube?
On aperture, Celestron C5 optical tube leads: 127 mm versus 102 mm.
How do Celestron Astro Fi 102 and Celestron C5 optical tube compare?
On aperture, Celestron C5 optical tube leads: 127 mm versus 102 mm.