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General| Aperture | 90 mm |
|---|---|
| Focal Length | 1250 mm |
| Focal Ratio | f/13.8 |
| Optical Design | Maksutov-Cassegrain |
| GoTo | Yes (AutoStar) |
| Highest Useful Magnification | 180x |
| Lowest Useful Magnification | 13x |
| Limiting Stellar Magnitude | 12.5 |
| Resolution (Rayleigh) | 1.55 arcseconds |
| Resolution (Dawes) | 1.29 arcseconds |
| Light Gathering Power | 165x |
| Eyepiece | 26 mm Super Plössl |
| Finderscope | 8x |
| Mount Type | Fork mount |
Introduces the ETX Observer telescope system, its features, and the user experience it offers.
Guide to assembling the tripod, mounting the telescope, and connecting essential accessories.
Instructions for powering on the telescope, using the Red Dot Finder, and initial checks.
Covers home position, finding North, initializing AudioStar, and performing Easy Alignment.
Details on navigating AudioStar menus and using 'Go To' and 'Guided Tour' features.
Diagram labeling the external components of the ETX 80 telescope.
Detailed explanations of each numbered feature of the ETX 80 telescope.
Diagram labeling the external components of the ETX 90/125 telescope.
Detailed explanations of each numbered feature of the ETX 90/125 telescope.
Introduction to the AudioStar handbox, its buttons, display, and core functions.
Explains navigating AudioStar menus, using the Object and Guided Tour menus.
Instructions for inputting text and numbers, and defining user objects in AudioStar.
Overview of AudioStar's operational categories and menu structure for telescope control.
Practical exercise to demonstrate menu navigation by calculating sunset time.
Details categories within the Object menu for finding celestial bodies like planets, stars, and nebulae.
Accesses astronomical events and utilities like timer, alarm, and eyepiece calculations.
Explains how to configure telescope settings like date, time, location, and model.
Instructions for storing multiple geographic observing locations in AudioStar's memory.
Methods for finding objects not in the database, user-entered objects, and identifying unknown celestial bodies.
Details on Two-Star, One-Star, and Browse alignment methods for enhanced accuracy.
Guide to observing satellites and creating custom guided tours for celestial exploration.
Explains how eyepieces affect magnification and field of view for optimal viewing.
Details alternative power options and lists additional accessories for extended functionality.
Guidelines for safely cleaning telescope optics and inspecting them for quality.
Recommendations for storage, transport, and solutions for common telescope operational problems.
Procedure to improve telescope pointing accuracy by training the drive motors.
Introduction to astronomical objects, focusing on the Moon, its features, and viewing.
Information on viewing planets like Saturn and Jupiter, and deep-sky objects like nebulae and galaxies.
Technical specifications for the ETX 80 Observer Back Pack Telescope model.
Technical specifications for the ETX 90 Observer Portable Observatory model.
Technical specifications for the ETX 125 Observer telescope model.
Explains Right Ascension (RA) and Declination (Dec.) for celestial navigation and object location.
Guide to polar mounting and using AudioStar's Easy, One-Star, and Two-Star alignment procedures.
Instructions on how to use the telescope's R.A. and Dec. setting circles for locating celestial objects.
Lists latitudes of major cities worldwide to assist with polar alignment procedures.
Details the optical design of the ETX 80 telescope, including its achromatic refractor system.
Explains the optical design of the ETX 90 and 125 telescopes, featuring the Maksutov-Cassegrain system.
Information on the environmentally safe disposal of the product according to EU regulations.
Details the warranty period, terms, and conditions for Meade telescopes and accessories.
Provides contact information and procedures for obtaining customer support and technical assistance.
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