Optical reference
Celestron NexStar Evolution 9.25: aperture, focal length and eyepiece fit
What the Celestron NexStar Evolution 9.25 measures, the magnification and true field each eyepiece produces in it, and the barrel, mount payload and camera adapter that fit.
Published specifications
Eyepiece ladder
2 pairings| Pairing | Magnification | True field |
|---|---|---|
| Celestron Omni 6mm Plossl in the Celestron NexStar Evolution 9.25 | 392x | 0.13 deg |
| Tele Vue 20mm Plossl in the Celestron NexStar Evolution 9.25 | 118x | 0.43 deg |
The Evolution 9.25 carries the sharp-imaging 235 mm f/10 C9.25 optics on a WiFi fork mount. Its 2350 mm focal length is a high-resolution planetary and lunar instrument that the fork can still slew smoothly.
Because magnification is the telescope's 2350 mm focal length divided by the eyepiece focal length, a 25 mm eyepiece gives 94x here and a 10 mm eyepiece gives 235x. The highest useful magnification is the published 555x, beyond which the image dims and softens without showing more detail.
The focuser takes 2 in eyepieces, so long 2 in wide-field eyepieces such as the Omni 56 mm fit as well as 1.25 in ones.