Orion SkyQuest XT4.5 Classic Dobsonian vs Orion SkyQuest XT8 Classic Dobsonian: specs compared
Updated 05 September 2026.
203 mm
Orion SkyQuest XT8 Classic Dobsonian wins on aperture
On aperture, Orion SkyQuest XT8 Classic Dobsonian leads: 203 mm versus 114 mm.
| Spec | Orion SkyQuest XT4.5 Classic Dobsonian | Orion SkyQuest XT8 Classic Dobsonian |
|---|---|---|
| Aperture | 114 mm (4.49 in) | 203 mm (7.99 in) |
| Focal length | 900 mm | 1200 mm |
| Focal ratio | f/7.9 | f/5.9 |
| Optical design | Newtonian reflector (parabolic primary) | Newtonian reflector (parabolic primary) |
| Focuser / eyepiece barrel | 1.25 in rack-and-pinion focuser | 2 in Crayford focuser with a 1.25 in adapter |
| Mount | Manual Dobsonian base | Manual Dobsonian base |
| Highest useful magnification (2x aperture rule) | about 228x | about 406x |
Questions and answers
Which has the higher aperture, Orion SkyQuest XT4.5 Classic Dobsonian or Orion SkyQuest XT8 Classic Dobsonian?
On aperture, Orion SkyQuest XT8 Classic Dobsonian leads: 203 mm versus 114 mm.
How do Orion SkyQuest XT4.5 Classic Dobsonian and Orion SkyQuest XT8 Classic Dobsonian compare?
On aperture, Orion SkyQuest XT8 Classic Dobsonian leads: 203 mm versus 114 mm.