Optical reference
Celestron C14 optical tube: aperture, focal length and eyepiece fit
What the Celestron C14 optical tube 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 |
|---|---|---|
| Explore Scientific 6.7mm 82 Degree in the Celestron C14 optical tube | 584x | 0.14 deg |
| Tele Vue 21mm Ethos in the Celestron C14 optical tube | 186x | 0.54 deg |
The C14 is the largest Schmidt-Cassegrain in the C-series, 356 mm of aperture at a 3910 mm focal length. It needs a heavy mount and gathers enough light for demanding deep-sky and high-resolution planetary work.
Because magnification is the telescope's 3910 mm focal length divided by the eyepiece focal length, a 25 mm eyepiece gives 156x here and a 10 mm eyepiece gives 391x. The highest useful magnification is the published 840x, 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.