Optical reference
Sky-Watcher Classic 200P (8-inch Dobsonian): aperture, focal length and eyepiece fit
What the Sky-Watcher Classic 200P (8-inch Dobsonian) 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 4mm Plossl in the Sky-Watcher Classic 200P (8-inch Dobsonian) | 300x | 0.17 deg |
| Celestron Omni 12mm Plossl in the Sky-Watcher Classic 200P (8-inch Dobsonian) | 100x | 0.5 deg |
The Classic 200P is the archetypal 8 in f/5.9 Dobsonian: 203 mm of aperture at a 1200 mm focal length on a simple, stable base. Its 2 in focuser takes long 2 in eyepieces for the widest possible fields.
Because magnification is the telescope's 1200 mm focal length divided by the eyepiece focal length, a 25 mm eyepiece gives 48x here and a 10 mm eyepiece gives 120x. The highest useful magnification is about 406x (roughly twice the aperture in millimetres), 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.