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Astro-Tech AT80EDT f/6 ED Triplet Refractor OTA

Regular Price: $849.00

Special Price $749.00

Availability: In stock

For the backyard grab-and-go observer, for the Milky Way star field scanner, for the wide field imager, for the birder and terrestrial photographer . . . the Astro-Tech AT80EDT 80mm f/6 ED triplet apo is the Swiss Army knife of refractors.
Our Product #: AT80EDT
Astro-Tech Product #: AT80EDT
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Product Description

This new Astro-Tech AT80EDT refractor has:

• 80mm f/6 fully multicoated triplet apochromatic optics using an ED center element
• a rotating dual-speed 2.5" rack-and-pinion focuser with 10:1 ratio fine focusing
• durable nylon soft carry case
• a camera angle adjuster
• retractable lens shade/dew shield
• dual hinged split tube rings with a Vixen-style dovetail

For grab-and-go observing, Milky Way star field sweeping, and wide field astrophotography (as well an terrestrial observing and photography), many observers swear by a good fast focal ratio 80mm refractor. The 6.5 pound 80mm f/6 Astro-Tech AT80EDT ED triplet apo refractor is just that scope. It does it all.

The Astro-Tech AT80EDT'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. A built-in camera angle adjuster lets you fine-tune the composition of your astrophotos and the orientation of your equipment. The supplied 2" and 1.25" eyepiece holders use non-marring compression rings that won't scratch your eyepiece barrels. It even comes with a finder shoe, tube rings, and a dovetail plate.

This feature-laden 80mm Astro-Tech AT80EDT ED triplet apochromatic refractor offers exceptional optical and mechanical performance and features at a very reasonable price. It will do just about anything you want to do with a truly portable scope. Let it into your telescope family and you may never want to let it go.

Features of this Telescope . . .

ED apochromatic triplet refractor optics: 80mm (3.15") aperture, 480mm focal length, f/6 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 90mm 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 rotatable 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.

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 the standard equipment 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.

Built-in camera angle adjuster: The focuser drawtube's 2" eyepiece/accessory holder includes a built-in camera angle adjuster that lets you quickly adjust the angle of your camera for the best composition or to put the star diagonal at the most comfortable observing angle. A knob on the 2" eyepiece/accessory holder lets you unlock the camera angle adjuster, rotate it to the desired final angle, then lock it in place at whatever angle is most convenient for you. This camera angle adjuster is standard equipment, not an optional extra-cost accessory, as it is with some other scopes.

Optical tube: The very compact 15" long optical tube and focuser (17" long with lens shade extended) are finished in a durable white powder coated finish, with grey 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 90mm 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 5.4" 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.

Tech Details

Aperture 80mm
Binary and Star Cluster Observation Good
Focal Length 480mm
Focal Ratio f/6
Galaxy and Nebula Observation Fair
Highest Useful Magnification 160x
Lunar Observation Very Good
Weight 5.5 lbs.
Planetary Observation Very Good
Resolution 1.45 arc seconds
Telescope Type Refractor
Visual Limiting Magnitude 12
Warranty 1 year


Review by:
I ordered the scope on a Friday morning. It was at my doorstep the very next day (standard free shipping). Fit and finish are top notch. Smooth very well made focuser which was designed with mounting the ZWO EAF in mind. Tested last night with an Astro Tech field flattener. Pinpoint stars right to the edge using a ZWO ASI183mc. Sharp. Absolutely zero CA. I've been imaging for over ten years and have lost count of the number of scopes I've owned but I can safely state the AT80 EDT is near the top of the list. (Posted on 4/14/2024)
Review by:
It has been months since I purchased this telescope. Typically one has cloudy skies for a few night, I had a string of bad nights when I would have been able to use it. But last night, I finally did. It started crystal clear and soon started to cloud over. There was a near 1st quarter moon, which would have to do for the night. I got it into field of view, roughly focused, and then used the fine focus to sharpen the view. At 60x the details jumped out and I saw one of the most 3D-looking views of the moon in my 60 years in astronomy. I was taken aback that this 80mm scope delivered that level of resolution and sharpness. The moon's edge was crisp with no visible halo of false color. Earlier on I had gotten the scope out for its first light and Venus was a target for false color check. It too, dazzlingly bright showed no false color and razor sharp edges. An impressive little scope. 100% recommend it if an 80mm is a scope size you are looking at. (Posted on 2/16/2024)
Review by:
I have been using this scope for just under a year and it is absolutely the best purchase I've made so far in the hobby. I use it mainly for astrophotography, very little distortion (if any). I came from a 72mm doublet and a 6"SCT and have been meaning to mount those but I've love using this so much, the ease of use, locking in focus and holding it all night it's really made imaging easier. It may very well stay on the mount it's on and never come off (Posted on 9/11/2023)
Review by:
The AT80EDT refractor is a work of art. The optics are flawless with no chromatic aberration. Good contrast: Saturn looked wonderful even at only 40x. The workmanship demonstrates exceptional attention to detail. I wanted a solid refractor that's not cumbersome and this one fits the bill. It's an outstanding value. Buy one - you'll be glad you did. (Posted on 5/26/2023)
Review by:
I had the opportunity to use this scope for the first time last night and was amazed at how well it performed .Better than I had imagined.It cleared showed details in the Orion nebula eves as the moon was rising and making viewing less than ideal. M45,35,36,37,38, also very sharp. (Posted on 2/9/2023)
Review by:
I received my scope after an intense argument with FeDex who wouldn;t give me my item for an additional 3 days , said it wasn't on the truck.. The scope is great but on sale you don't get the CN discount (would be nice to know beforehand) Case is tiny but nice, no room for focuser or anything else besides the scope. Bought a larger pelican style case fior it. Overall pleased . (Posted on 1/24/2023)
Review by:
I have been using this scope for a few months now and I can say without a doubt this punches way above its weight. Perfect balance of features and quality for the price I paid. The focuser is rock solid and sleekly designed. Stars are clear, without aberration, chromatic or otherwise. I like the fact that it came with a camera angle adjuster too. I mean really? That is awesome value. (Posted on 12/27/2022)
Review by:
I've owned this telescope for about a year and highly recommend it as a grab-and-go telescope, or a supplement to a larger one that's used only for narrowfield views. With a 480mm focal length, this telescope excels at widefield views of the milky way. With a low-power eyepiece, finding things purely by scanning around is easy and fun.

For its size, this is not an ideal telescope for the planets; a small Maksutov-Cassegrain is a better choice--but it's no slouch. 4 gas bands on Jupiter are clearly visible, and all four Galilean moons are resolved into discs. The Cassini division in Saturn's rings is theoretically visible when seeing is good and the rings' tilt is favorable (though I haven't seen it yet). The product listing gives a highest useful magnification of 160x, and I've gone that high when viewing the planets with a 3mm eyepiece and it's fine. On calm nights, I definitely get the sense that I could go even a bit higher, if I owned an eyepiece capable of it.

At only about 6 pounds, the telescope is super portable. It's quite likely that the mount and telescope you use with it will be heavier. This is perfect, because it will be rock-solid and therefore easy to focus and pleasant to use. And if you have a mount capable of holding two scopes, it can easily ride in the secondary position.

Manufacturing quality is incredible. The optics are as flawless as I can discern. Star tests are perfect and there is no false color visible anywhere. At f/6, there is a bit of field curvature because this isn't a 4-element petzval design. This isn't an issue for visual use, but for astrophotography you'll want to use a field flattener. The 2-speed rack & pinion focuser is very robust and high quality with no play in it, and you can lock the focus to avoid bumping it later. It's much better than the crayford focusers you find in many other refractors, or the single-speed knob focusers on most SCT and MCT telescopes.The tube rings and built-in dew shield are likewise very premium. You would expect to pay hundreds more for equipment of this obvious quality.

I don't do astrophotography, but an f/6 refractor like this is reputed to be the perfect place to start.

Just buy it already! And if you have the cash, go up to the AT92 instead, which is like this telescope but better. (Posted on 4/15/2022)
Review by:
I have had my 80EDT for just over a year, along with the flattener/reducer. I started with a DLSR, and upgraded to a dedicated astro camera last summer. I am currently using it mostly for narrowband imaging. I have installed the ZWO focus motor. It's been a great scope to learn the hobby on. I have gotten some great images. (Posted on 2/1/2021)
Review by:
I've owned this scope for a year. It's an excellent scope and I have no regrets in this purchase. I do wish it had come with a longer dove tail. If you use a DSLR it's almost impossible to achieve a balance scope with the existing dovetail. To correct the situation , it needs a longer dovetail with extenders to raise the rings. (Posted on 1/13/2021)
Review by:
Initially was very impressed with the fit and finish of the scope, but what really made it impressive were the views and images taken through it! The stock focuser is smooth and solid, takes my imaging gear with no problems. I mainly image with this scope and it is truly a keeper. Great bang for your buck! (Posted on 10/23/2019)
Review by:
I did a star test of my Astro-Tech 80mm and I was blown away!. I saw perfect concentric circles in or out of focus. I kept using higher magnification eyepiece and there was NO degradation of the image...simple amazing optics and a beautiful finish. (Posted on 10/4/2019)
Review by:
This is a great grab and go scope with excellent optics. (Posted on 9/9/2019)
Review by:
I have had this product for roughly an year and its been fun. Combined with some added tech, this scope has been giving me good results taking photos ( sharp images) . I sometimes use this compact scope to photo shoot regular stuff and works awesome. For the price I paid, this scope combines compactness, great lenses, easy to carry and lastly great images. Good entry level scope, consider it if you're looking within a budget. (Posted on 8/1/2019)
Review by:
I purchased this telescope several years ago because of its reputation for quality and I liked the way it looked. I was not disappointed at all. Clear, sharp, views with both low power and high power. At a Star Party, a friend who is a respected astro-photographer, looked through it and decided he had to have it. I told him that others were in stock at Astronomics, but he had to have this one (found out later that he would only purchase telescopes that he had looked through). I recommend it for being a step-up from 80ED refractors for visual and astro-photography (based on my friend's experience). (Posted on 7/24/2019)
Review by:
I ordered this refractor on 8/21/2015, and it is my first APO refractor. I have been extremely happy with it. It is my main grab and go telescope. I also have the AT60ED. I use it almost exclusively for visual use and the view is outstanding. I also use it for EAA with SharpCap, and the Sky-Watcher AZ-GTi goto mount. The telescope is top quality, including the focuser and the built in rotator. For the price, you really can't go wrong!
(Posted on 7/23/2019)
Review by:
I use this scope for both astronomical photography and nature spotting scope. The workmanship is excellent as are the optics. (Posted on 7/22/2019)
Review by:
I have had this scope for a few years now, and it is my first real refractor telescope and I have been extremely happy with it. I use it almost exclusively for astrophotography and the images that I get out of this unit are just spectacular. All the hardware is top quality. The focuser is very smooth and the built in rotator is a very nice touch, one that is more handy than I expected it to be. For the price, you really can't go wrong with this scope!! (Posted on 7/22/2019)
Review by:
This was my first refractor, and could not be happier with it. Quality build, excellent focuser, and optics are great too! I've not had a chance to use it as much as I wanted since purchasing a couple of months ago, but the times I've had it out have been most enjoyable! Astronomy aside, it's just feels good in the hand and is solid all the way around! (Posted on 1/13/2019)
Review by:
I am using this Refractor for quite sometime. The 80mm range pretty balance one. Its sits well
on my Orion Atlas EG-Q mount along with DSLR and ZWO ASI 294 MC Pro. The optics are clear, and without any aberration. I am not very savvy with astrophotography but I have taken pretty impressive shots of DSO with this telescope.
I have also tried it on Star Adventure mount, But its kind heavy and stress the mount. (Posted on 1/2/2019)
Review by:
This is a well built scope with excellent optics for a very reasonable price. I am very pleased with my purchase. (Posted on 12/29/2018)
Review by:
This may be one of the best telescopes I have used for astrophotography on a budget. When using this I normally use my unmodified Nikon D5300 with a Celestron AVX if I cannot see Polaris to get a perfect polar alignment. Even in my very high light polluted backyard of the suburbs of Chicago, I can still get very good images of Deep Sky Objects. Keeping in mind though that, that has to do with a lot of stacking to reduce the noise and post-processing. (Posted on 12/28/2018)
Review by:
grb n go, good price (Posted on 12/7/2018)
Review by:
This is a really fine small refractor, the best of about six that I've owned. Sharp images, excellent contrast, my all-time favorite travel and grab 'n go scope. Small enough to sit solid on a good lightweight tripod with an alt-az mount. Two-inch focuser lets me use wide angle low power eyepieces. Very happy with it! (Posted on 11/14/2018)
Review by:
The best compliment is “OH WOW’ and I receive lots of them when participating in outreach events showing Jupiter or the edge of the moon. This scope is not only perfect for portable and travel but is top quality throughout, For astrophotography I would say the FL is about right to capture various nebula and especially the moon, Saturn, Mars and Jupiter. The image is super sharp with high contrast, no strange colored lights or rings to distort the image. Eye pieces are Explore Scientific 18mm and 5.5mm wide angle and the Tripod is a Celestron AVX. Being new to astronomy I had to rely on club experts to help with this choice and they know their business well. Also thanks to the staff at Astronomics for their advice. (Posted on 10/10/2018)
Review by:
I really like this telescope. I have owned it for over a year and use it day and night. The focuser holds well and is a solid unit. I did replace the dovetail as to better balance the telescope with a DSLR. Needed about an extra inch back. The coatings could be a bit more solid and less powdery. Otherwise, it has been a great and solid scope. (Posted on 10/9/2018)
Review by:
This is my "Grab n Go" scope, due to its small size/weight, wide FOV & clear sharp optics (no false color on targets - even Vega). I have it mounted on a Porta-II with "Train-N-Track" system which makes it easy to take out back last minute. It also makes a great travel scope when you just something to take with that is quick & easy. I added a moonlite motor focuser (higly recommended!) and it's still only 19" long when collapsed. It fits nicely in a small case & easy to take along on a quick trip! (Posted on 10/8/2018)
Review by:
I have had and used this product for a few months.
It has great clarity and minimal distortion. This is my go to scope because it is so convenient and performs so well. (Posted on 10/6/2018)
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