Astro-Tech AT130 EDT f/7 ED Triplet OTA Used


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Some observers feel that the Astro-Tech AT130EDT 5.12" f/7 ED triplet apochromatic refractor compares favorably in performance to scopes nearly four times its price. We won't go quite that far, but we will say that the AT130EDT is an exceptional performer and an exceptional value.
Our Product #: AT130EDTU
Astro-Tech Product #: AT130EDT
Recommended Accessories

Product Description

The customer decided the scope was just too big.  

This Astro-Tech AT130EDT refractor has:

• 130mm f/7 fully multicoated triplet apochromatic optics using an ED center element
• a dual-speed 2.5" rack-and-pinion focuser with 10:1 ratio fine focusing
• hard sided protective carry case
• a rotatable focuser
• a camera angle adjuster
• retractable lens shade/dew shield
• dual hinged split tube rings with a Vixen-style dovetail

There are competitive 130mm-range apo scopes that can cost up to $6500 and more. Do they perform nearly four times better than the Astro-Tech AT130EDT to justify the price difference? That's up to you to decide. But while they can cost nearly four times as much, many observers will be hard-pressed to justify the cost difference between those other scopes and the Astro-Tech AT130EDT. To our minds, that makes the Astro-Tech AT130EDT an exceptional value.

The Astro-Tech AT130EDT's slow-polished triplet optics, ED glass center element, and state-of-the-art optical multicoatings are even more impressive when you consider the package they come in. The finely-machined scope has a dual-speed 2.5" rack-and-pinion focuser with a microfine 10:1 fine-focusing ratio. The focuser can rotate a full 360° to put your camera or eyepiece in the most comfortable observing position. In addition, a built-in camera angle adjuster lets you fine-tune the composition of your astrophotos. The supplied 2" and 1.25" eyepiece holders use non-marring compression rings that won't scratch your eyepiece barrels.

This feature-laden 130mm Astro-Tech ED triplet apochromatic refractor offers optical and mechanical performance nearly the equal of scopes many times its reasonable price. No matter how you look at it, at the price, the Astro-Tech AT130EDT is an absolute steal!

Features of this Telescope . . .

ED apochromatic triplet refractor optics: 130mm (5.12") aperture, 910mm focal length, f/7 focal ratio. It uses an ED (Extra-low Dispersion glass) center element to reduce spurious color halos and fringing to vanishingly low levels. All three lens elements are slow-polished for smooth surfaces, with less scattered light.

Fully multicoated optics: The triplet objective lens has the latest state-of-the-art antireflection multicoatings on all air-to-glass surfaces for high light transmission and excellent contrast. This can easily be seen by looking into the objective lens of the scope. Virtually no reflection of your face will be seen. It's a sure sign that the high transmission coatings are doing their job, by letting virtually all the light enter the scope, rather than reflecting some light back to your eye.

Internal light baffles: Contrast-enhancing knife-edge light baffles in the 140mm diameter optical tube provide truly dark sky backgrounds and high terrestrial contrast. The edges of the lenses are blackened to reduce internal reflections and further improve image contrast.

Dew shield: A self-storing retractable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the effect of the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as from a neighbor's backyard security light.

Dual speed 2.5" rack-and-pinion focuser: The precision-made focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during high magnification visual observing and critical CCD imaging.

The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather. The focuser drawtube has 75mm of travel and a millimeter scale on the drawtube to let you return to an approximate focus when switching between visual and photographic setups. A lock knob under the focuser lets you lock in your photographic focus.

The 2.5" focuser can be rotated a full 360° to line up a camera in either a landscape or portrait orientation (or any orientation in between), as well as put a star diagonal and eyepiece into the most comfortable observing position. Simply loosen the knob on the top of the focuser housing, rotate the focuser to whatever angle is most convenient for you, and then tighten the knob to lock the focuser at the desired angle.

Built-in camera angle adjuster: In addition to the entire focuser rotating, the focuser drawtube's 2" eyepiece/accessory holder includes a built-in camera angle adjuster that lets you quickly make final small adjustment tweaks to the angle of your camera or star diagonal without having to disturb the heavier focuser proper. This camera angle adjuster is standard equipment, not an optional extra-cost accessory, as it is with some other scopes.

The Astro-Tech AT130EDT allows imaging with a DSLR or CCD using an APS-C or equivalent sensor (29mm diagonal) with no vignetting. Adding the dedicated reducer/field flattener, #ATREDT30, will allow imaging with a full frame DSLR (43mm diagonal sensor) with only minor vignetting at the corners of the image.

A knob on the 2" eyepiece/accessory holder lets you unlock the accessory holder, rotate it to the desired final angle, then lock it in place at whatever angle is most convenient for you. Many observers will find this camera angle adjuster to be even more convenient that the focuser rotation system and will use this method of adjusting the viewing angle exclusively.

Compression ring eyepiece holders: The focuser's 2.5" drawtube terminates in a 2" eyepiece holder that uses a non-marring compression ring to hold a 2" star diagonal and/or accessories in place. The compression ring won't scratch the barrel of your star diagonal and accessories as an ordinary thumbscrew can.

A supplied 1.25" accessory adapter slips into the 2" eyepiece holder to let you use a 1.25" star diagonal, image erecting diagonal, or photographic accessories. Like the 2" eyepiece holder, the 1.25" adapter also uses a non-marring compression ring to hold 1.25" star diagonals and accessories in place.

Optical tube: The 32.4" long optical tube and focuser (37.5" long with lens shade extended) are finished in a durable white and black powder coated finish, with black anodized trim. There is a finderscope mounting shoe that accepts Vixen-style finderscope mounting brackets. The shoe can be mounted on either the top left or top right side of the focuser body. A slip-on metal dust cap is standard, as is a dust seal for the eyepiece holder.

Tube rings and dovetail: Dual split hinged tube rings are supplied for the 140mm o. d. optical tube. The rings are lined with white felt that will not stain the white finish of the scope over time, unlike the black felt supplied with other scopes. A 9.7" long Vixen-style dovetail is bolted to the tube rings. Optional Losmandy-style D-plate dovetails are available if your mount uses a wider Losmandy-style saddle.

Hard Case:  The Astro-Tech AT130CA hard case is designed to hold the Astro-Tech AT130EDT 130mm triplet ED apo refractor. It measures 35" (889mm) long, 10.25" (260mm) wide, and 11.25" (286mm) deep including the feet that prevent the case from resting directly on the ground.

The aluminum-framed case has three locking latches and a spring-loaded handle that lies flat when not being used to carry the case. The rigid protective foam inside the case is die-cut specifically to hold the AT130EDT scope only, without accessories. The case weighs 13 pounds (5.9 kg).

Tech Details

Aperture 130mm
Binary and Star Cluster Observation Very Good
Focal Length 910mm
Focal Ratio f/7
Galaxy and Nebula Observation Good
Highest Useful Magnification 260x
Lunar Observation Great
Weight 19 lbs.
Planetary Observation Very Good
Resolution 0.89 arc second
Telescope Type Refractor
Visual Limiting Magnitude 13.1
Warranty 1 year


Review by:
After many years owning high end refractors - Taks and Astro-Physics , I decided to try out an AstroTech product. What a fantastic telescope. Images are pinpoint with that classic jewels on black velvet display. Couldn’t be happier with my purchase. A terrific bargain. (Posted on 1/3/2022)
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