Meade ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope

Meade ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope

Meade ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope

B&H # MEETX90OT MFR # 205004
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Meade ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope

Meade ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope

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Product Highlights

  • 90mm Maksutov-Cassegrain Telescope
  • 1250mm Focal Length, f/13.8 Focal Ratio
  • UTHC Fully Multi-Coated Optics
  • Dual-Fork Motorized Alt-Az Mount
  • AudioStar GoTo Hand Controller
  • 30,000+ Object Updatable Database
  • Guided Tours, Multiple Alignment Options
  • Adjustable Stainless Steel Tripod
  • Two Eyepieces and Red-Dot Finder
  • Hard OTA/Mount Carrying Case, Tripod Bag
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Accessories: Observer Accessory Package

Observer Accessory Package Standard Accessory Package

Not available with current selections

Aperture: 90mm f/13.8

127mm f/15

Not available with current selections

90mm f/13.8
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Meade ETX90 overview

  • 1Description

Meade Instruments gives you a complete GoTo-enabled observation rig with the ability to make detailed observations of the Moon, easily see planets, and reach outside the solar system to resolve bright deep-space objects with their venerable ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope. The compact and powerful Maksutov design uses a front corrector plate with a convex meniscus lens to correct off-axis aberrations, like comas, and chromatic aberration to produce images with true-color rendition. The nature of the lens results in a smaller secondary mirrorlimiting obstruction and increasing contrast, while eliminating the need for periodic collimation. This optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt-Cassegrain variant, but the optical benefits makes this an ideal scope for all types of celestial observations.

For those who want to use it for astrophotography, an internal mirror flips down to direct the light path straight back for prime-focus photography using a DSLR camera body and optional adapters. An equatorial tilt plate is integrated into the tripod, which allows for proper polar alignment and single-axis tracking for smoother and more precise tracking as required by long-exposure photography.

The brain of this system is Meade's revolutionary AudioStar hand controller. Equipped with a 2-line LED display and 20-key red backlit keypad and an integrated speaker, it controls the motorized mount for precise GoTo capabilities. Its internal 30,000+ object database is updatable via the Internet and has the capability to take you on a hands-free guided tour of the night sky above, with audio commentary on select objects with expanded information. To consult star charts and logs, or to change eyepieces and filters, the controller also has a built-in red LED utility light that won't affect your night-adjusted vision.

Optical Tube Assembly
  • 90mm aperture
  • f/13.8 focal ratio
  • 1250mm focal length
  • Maksutov-Cassegrain optical configuration
  • Front convex meniscus lens corrects spherical and chromatic aberrations and comas (off-axis aberrations) across the entire field of view
  • Smaller secondary mirror versus Schmidt-Cassegrains reduces obstructions and increases contrast
  • Proprietary Ultra-High Transmission Coating (UTHC) system improves light transmission for brighter images and increases color fidelity and contrast
  • Resolution: 1.29 arcsec
  • Internal flip mirror for dual viewing: Find, center, and focus a target object visually with an eyepiece, then photograph it with a camera without changing gear
  • Internal focusing system
  • Vixen-style dovetail plate
AudioStar Hand Controller
  • 2-line LED display
  • 20-key alphanumeric keypad, red LED backlight
  • 68HC11, 8MHz processor
  • Built-in red utility light
  • 30,000+ object database
  • User-friendly menu-driven system navigation
  • Slew speeds: 1x, 2x, 8x, 16x, 64x, 0.5°/sec, 1°/sec, 1.5°/sec, 4°/sec (max)
  • Assisted alignment procedures: Easy (Two-Star), One-star, Two-star, Three-star
  • Customizable guided tours for specific date, time, and location
  • Built-in speaker provides descriptions of over 500 objects including scientific data and history
  • Projects events to plan future astronomy sessions such as sunrises/sunsets, moon phases/moonrises/moonsets, meteor showers; lunar/solar eclipses, equinoxes/solstices
  • Backlash compensation allows user to train out the intrinsic play between gears to improve GoTo and tracking accuracy
  • Powered by mount to be lighter and easier to use
  • 24" coiled cord
  • Updatable via Internet using RS-232 port
  • Database details:
  • Solar system, including Moon, Sun, planets
  • Comets and asteroids
  • 88 major constellations
  • Popular named objects
  • Galaxies, quasars, and nebulae
  • Multiple catalogs including Messier, Caldwell, and NGC
  • Stars, including named stars, SAO catalog, double stars, variable stars
  • Satellites, including the International Space Station (ISS) and Hubble Space Telescope (HST)
  • User-defined astronomical and terrestrial objects
  • Dimensions:
  • Length: 6.6" (17cm)
  • Width, top: 3.2" (80cm)
  • Width, bottom: 2.25" (57cm)
  • Depth: 0.8" (21cm)
  • Weight: 17.9 oz (508g)
Mount and Tripod
  • Mount:
  • Dual-tine alt-azimuth fork
  • Vixen-style dovetail saddle
  • 1/4"-20 mount to attach onto many photo/video/field tripods
  • Dual DC servo motors with encoders
  • Bearings: Altitude: UHMW polyethylene; Azimuth: PTFE
  • Runs on six user-supplied AA batteries with a max runtime of 20 hours when using AudioStar
  • Compact design: 15x7x9"
  • Tripod:
  • Adjustable height
  • Stainless steel legs
  • Leg-locking plate for additional stability
  • Center column hook for bags, weights, or anchors to add stability and reduce vibrations
  • Equatorial mounting plate for precise polar alignment required for long-exposure astrophotography
Included Accessories
  • Finder:
  • Unmagnified, enables fast and easy alignment
  • Simple red-dot reticle won't obscure small or dim targets
  • Adjustable intensity
  • Eyepieces:
  • 1.25"-diameter barrel
  • Accepts most 1.25" astronomical filters
  • 26mm Super Plössl produces 48x
  • 9.7mm Super Plössl produces 129x
  • Carrying Options:
  • Hard carrying case with custom-cut foam lining for OTA, mount and accessories
  • exterior protects during transport and storage
  • Carrying bag for tripod with shoulder strap
UPC: 709942997514
In the Box
Meade ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope
  • Red-Dot Finder
  • Super Plössl 9.7mm Eyepiece
  • Super Plössl 26mm Eyepiece
  • Equatorial Mounting Plate
  • Stainless Steel Tripod
  • Mount/OTA Hard Carrying Case
  • Tripod Carrying Bag
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Meade ETX90 specs

    Optical Design Maksutov-Cassegrain
    Aperture 90mm
    Focal Length 1250mm
    Focal Ratio f/13.9
    GoTo System AudioStar computer hand controller
    Eyepiece Barrel Diameter 1.25"
    Diagonal Internal 90° flip
    Viewfinder Red-Dot
    Tripod Adjustable-height stainless steel
    Mount Type Motorized, dual-tine alt-azimuth fork
    Power Source 6 x AA batteries
    Runtime 20 h max
    Dimensions OTA: 11.0 x 4.1" / 10.4 x 27.9 cm
    Total: 15.0 x 9.0 x 7.0" / 38.0 x 22.0 x 18.0 cm
    Weight OTA/Mount: 9.5 lb / 4.3 kg
    Tripod: 9.75 lb / 4.4 kg
    Carrying case: 10.0 lb / 4.5 kg
    Packaging Info
    Package Weight 43.0 lb
    Box Dimensions (LxWxH) 34.0 x 26.0 x 12.0"

    Meade ETX90 reviews

    ETX90 Observer 90mm f/13.8 Maksutov-Cassegrain GoTo Telescope is rated 4.0 out of 5 by 2.
    Rated 5 out of 5 by from The Perfect Beginner Telescope I have been using this telescope for about 13 years now. It has never failed, and always delivered. The autostar system works reliably, and once you figure out how to align it, it will serve you for ears. The optics on this scope are wonderful, and they deliver the best performance you can expect from a small aperture. This is especially an empowering telescope for young beginners. I began using this model when I was in elementary school, and the views this telescope provides (hundreds of star clusters, nebulae, planets) sparked a lifelong interest in space. Largely because of the excitement I felt, and still feel when looking through this scope, I continued to love outer space, and I now study astrophysics at UC Berkeley.
    Date published: 2016-06-03
    Rated 3 out of 5 by from Fun first telescope, with issues TL;DR Got this for the 2017 eclipse because 1) tracking 2) flip mirror to switch between camera and eyepiece. THE GOOD: great optics; easy to put together, awesome custom tripod. Can be used in Alt/Az or Polar mode (built-in equaltorial wedge). THE BAD: Audiostar user interface is barely usable e. Camera and eyepiece focus are not remotely in sync. Altitude motors too weak to lift 1lb camera. THE UGLY: center of eyepiece does not match center of camera projection. Cheap, fragile case (separated on first trip). No great receptacle for Audiostar. If it drops and the scope is tilted in polar mode it WILL mess up the tracking. Warning: not a good choice for working with a heavy DSLR. A counterbalance will be required, and none are manufactured so you'll get to make your ow. I used a Nikon D90 which weighs about a 1.5 lbs (750g) and this was too much for the altitude motors, It worked in polar mode for the eclipse. To attach camera, you need a T-ring specific to your camera mount and the Meade SLR Camera Adapter or a Meade Variable Adapter. You will also need a Meade 2x Short-Focus Barlow with the lens removed (it unscrews) to get the eyepiece focus within range of the camera. Focus the camera and then use the eyepiece screw to fine focus. Now your flip mirror works as expected.
    Date published: 2017-08-22
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