astro-tech AT80EDT

Thank you for choosing our Astro-Tech AT80EDT high- performance apochromatic triplet ED refractor.

While some observers might doubt that you can get apochromatic performance from an 80mm scope that is as inexpensive as the Astro-Tech AT80EDT, we can say only that seeing is believing.

The images from its fully-multicoated 560mm f/7 ED (Extra-low Dispersion element) premium Ohara glass triplet optics are virtually color-free, even at high

from Astronomy Technologies

magnifications. At its low price, we believe you will find that the visual and photographic performance of your AT 80EDT triplet is little short of remarkable.

This instruction sheet will provide you with information on how to get the most out of your new refractor, and how to properly maintain your scope so it can give you a lifetime of observing enjoyment.

Please familiarize yourself with your telescope’s parts and functions before operating it for the first time.

PARTS OF THE AT80EDT

1.25” eyepiece

Locking collar for 360°

Retractable

Mounting point for

 

 

 

 

lock knob

rotatable focuser

dew shield

optional finder

 

Focusing

 

 

 

 

 

 

 

 

 

 

scale on

 

 

 

 

 

focuser

 

 

 

 

 

drawtube

Fine focus

knob Right coarse focus knob

 

 

Combined equatorial mount

Left coarse

Lock knob for

 

dovetail and L-bracket

focus knob

focuser drawtube

tripod mounting shoe

 

 

 

 

 

 

 

1/4”-20 thread

2”

 

tripod mounting holes

 

eyepiece

 

in base of reversible

Dust cover

holder

 

bracket

 

 

 

 

1.25”

 

 

 

 

 

Brass compression ring

 

 

eyepiece

 

 

lock knob

 

 

 

 

 

1.25” eyepiece

1.25”

eyepiece

 

 

lock knob

 

 

adapter

 

 

 

 

 

Fine focus knob

1.25”Right

eyepiece coarse

adapterfocus knob

2” eyepiece

lock knob

Astro-Tech AT80EDT Apochromatic Triplet Refractor Specifications

Aperture

80mm (3.1”)

Focal Length

560mm

Focal Ratio

f/7

Objective Type

triplet using Ohara ED glass

Optical Coatings

fully multicoated

Resolving Power (Dawes’ Limit)

1.45 arc seconds

Visual Limiting Magnitude

12.0 maximum

Light Grasp (versus the eye)

131x

Field Stops

glare-reducing baffle in optical tube

Focuser

dual-speed Crayford-type

 

with 11:1 reduction ratio fine focus;

2” and 1.25” compression ring eyepiece holders; 360° rotating camera angle/observing angle adjuster

Focuser Travel

3.1” (80mm),

millimeter scale on drawtube for repeatable focus

Lens Shade

retractable

Objective Lens Cover ......................... slip-on metal

Tripod Mount .. removable combination L-bracket and dovetail for direct mounting on Celestron, Meade, and Vixen equatorial mounts; two 1/4”-20 thread mounting holes for photo tripod use

Tube Diameter

 

90mm o. d.

Tube Length (lens shade retracted)

17.75” (451mm)

Tube Length (lens shade extended) ...

20.25” (514mm)

Optical Tube Weight

6.75 lbs. (3.07 kg)

Case

aluminum-frame foam-fitted

lockable hard case, with carrying handle

Case Dimensions

22.25” x 12.75” x 8.25”

Lowest Usable Power

14x (40mm eyepiece)

Highest Terrestrial Power

....... 80x

(7mm eyepiece)

Highest Practical Power

140x

(4mm eyepiece)

Theoretical Maximum

187x

(3mm eyepiece)

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Meade instruction sheet Astro-tech AT80EDT, From Astronomy Technologies, Parts of the AT80EDT

AT80EDT specifications

The Meade AT80EDT is a sophisticated telescope designed for both amateur astronomers and astrophotographers who seek a balance between portability, high-quality optics, and affordable pricing. This refractor telescope features an 80mm aperture, making it a versatile instrument suitable for a wide range of astronomical observations, from planets in our solar system to expansive deep-sky objects.

One of the standout attributes of the AT80EDT is its doublet ED (Extra-low Dispersion) optical design. The ED glass minimizes chromatic aberration, resulting in sharp and clear images with true color rendition. The telescope's focal length of 600mm provides a focal ratio of f/7.5, allowing it to gather a significant amount of light while also offering a range of magnifications suitable for both wide-field observations and more detailed views of celestial targets.

Constructed with a robust aluminum body, the Meade AT80EDT ensures durability while remaining lightweight enough for easy transportation. The telescope's design includes a 2" dual-speed Crayford focuser, allowing for precise fine-tuning of focus during both visual observation and imaging. This focuser can accommodate 2" and 1.25" eyepieces, enhancing its versatility.

The AT80EDT is also equipped with a retractable dew shield, which helps prevent dewing during long observation sessions and aids in minimizing stray light. Additionally, the telescope comes with a mounting plate compatible with standard mounts, providing users with flexibility in their setup.

Considering its characteristics, the Meade AT80EDT is aimed not only at visual observers but also at those interested in astrophotography. Its excellent optical performance, combined with a range of complementary gear and camera attachments, allows astrophotographers to capture stunning images of the night sky.

Moreover, the Meade brand is known for its reliable customer service and extensive range of accessories, making it easy for users to enhance their experience with the AT80EDT. With excellent optics, thoughtful design, and an affordable price point, the Meade AT80EDT stands out as a compelling choice for anyone looking to deepen their exploration of the universe. Whether you are starting your astronomical journey or a seasoned observer, this telescope promises to deliver a satisfying experience.