The Celestron AstroMaster-90 is a very good telescope for beginners. It is ideal for both terrestrial and celestial applications. The AstroMaster-90 offers multi-coated glass optics to allow clear and crisp images. This refractor model can also be used for astrophotography with an appropriate T-Mount adapter. It comes with a rugged, pre-assembled tripod, both 10mm and 20mm eyepieces and a permanent mounted StarPointer finder scope to easily locate heavenly objects.
| Optical Design | Achromatic refractor |
| Optical Lens Diameter | 3.5" (90mm) |
| Focal Length | 1000mm |
| Focal Ratio | f/11.1 |
| Maximum Useful Magnification | 177x |
| Resolving Power | Not Specified by Manufacturer |
| Optical Tube Dimensions | Not Specified by Manufacturer |
| Mount Type | Altazimuth |
| Eyepiece Barrel Diameter | 1.25" |
| Finderscope | Mounted StarPointer |
| Tripod | 1.25" steel tube legs |
| Motor | No |
| GO-TO Capability | No |
| PC Compatible | No |
| Power Source | None |
| Weight | 20.0 lbs (9.07kg) |