Celestron AstroMaster 90EQ Telescope
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Product Code : SCL-PLE-12899
Quick Answer: The Celestron AstroMaster 90EQ Telescope is a 90mm refractor telescope with a 1000mm focal length on a manual CG-3 German equatorial mount and steel tripod. It is supplied with 20mm and 10mm eyepieces giving 50x and 100x.
Last updated: October 2026
Key Features
- Refractor with 90mm (3.54") aperture and 1000mm focal length, f/11
- Manual German equatorial mount with setting circles and slow motion controls on both RA and DEC axes
- Adjustable full-height steel tripod with accessory tray
- No-tool setup
- 20mm and 10mm eyepieces, erect image diagonal and StarPointer finderscope
- Multi-coated optics
Technical Specifications
| Specification | Value |
|---|---|
| Optical design | Refractor |
| Aperture | 90mm (3.54") |
| Focal length | 1000mm (39.37") |
| Focal ratio | f/11 |
| Eyepiece 1 | 20mm, 50x |
| Eyepiece 2 | 10mm, 100x |
| Highest useful magnification | 213x |
| Lowest useful magnification | 13x |
| Limiting stellar magnitude | 12.3 |
| Resolution | 1.55 arc seconds (Rayleigh); 1.29 arc seconds (Dawes) |
| Light gathering power | 165x the human eye |
| Optical tube length | 914mm (36") |
| Mount | CG-3 Equatorial, manual slewing |
| Height adjustment | 812.8mm - 1295.4mm (32" - 51") |
| Tripod | Steel, 31.75mm (1.25") legs, 3447.3 g |
| Star diagonal | Erect image diagonal, 1.25" |
About This Product
The telescope is used for observing the Moon, planets and star clusters. The equatorial mount with setting circles helps locate and track sky objects, and its two slow motion knobs give fine pointing adjustments in Right Ascension and Declination. The two eyepieces give low and high-powered views.
Frequently Asked Questions
What magnifications does the Celestron AstroMaster 90EQ Telescope give?
The 20mm eyepiece gives 50x and the 10mm eyepiece gives 100x. The highest useful magnification is 213x and the lowest is 13x.
What is included?
The optical tube, a preassembled tripod and mount, 20mm and 10mm eyepieces, a red-dot finderscope and a manual.
What type of mount does it use?
A manual CG-3 German equatorial mount with setting circles and slow motion controls on the RA and DEC axes, on an adjustable steel tripod.
Related: Physics Lab Equipment, Abbe Refractometer, Digital.
For a quotation on the Celestron AstroMaster 90EQ Telescope, contact School Lab China.
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