Astro-Tech AT65EDQ 65mm f/6.5 ED quadruplet astrograph


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This unique Astro-Tech apochromatic dual ED quadruplet fast focal ratio refractor uses an ED triplet objective lens, plus a built-in ED singlet lens field flattener, to give you exceptional flat field/very wide field imaging capabilities at an affordable price . . .

Our Product #: AT65EDQ
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Product Description


This Astro-Tech AT65EDQ ED refractor astrograph has:

• 65mm f/6.5 fully multicoated four-lens/two-group (triplet/singlet) refractor
• two ED lens elements, including an FPL-53 element in the objective
• 110mm of backfocus
• amazing flat field astrophotographic capabilities and a 44mm image circle to boot
• dual-speed 2" rack-and-pinion focuser with 10:1 ratio fine focusing
• 2" and 1.25" non-marring compression ring accessory holders
• rotating camera angle adjuster
• split mounting rings with Vixen-style dovetail
• sliding lens shade with lock knob
• finderscope mounting shoe

This unique apochromatic ED quad refractor astrograph has a four lens/two group/two ED element fully-multicoated optical system. It uses an FPL-53 element in its apochromatic triplet objective lens, and has a separate field-flattening proprietary ED singlet lens at the rear of the optical tube.

The very sensibly-priced Astro-Tech AT65EDQ astrograph provides an exceptionally flat field for very wide DSLR and CCD deep space images that are sharp edge-to-edge, with no need for a separate field flattener. While designed primarily as an astrograph, it can also be used visually with a 1.25" star diagonal and eyepieces.

To see an impressive image of the North American Nebula showing the flat field capability of the AT65EDQ, taken by Luke Leege, please look through the images above. The NGC700 image was take by Luke using a Canon EOS 7D DSLR camera. Luke took 12 five minute exposures and 7 ten minute exposures with appropriate darks and flats. He combined them using Deep Sky Stacker freeware and processed the result in Photoshop CS3.

Another good example of the AT65EDQ's capability in the hands of an experienced astrophotographer is Jeremy Vandermeer's image of the Rosette Nebula, also found in the images above. It was taken from the light-polluted suburbs of Chicago. Jeremy combined 47 separate 240 second exposures taken with a modified Canon T1i to produce the final image, which we think compares quite favorably with professional images taken with much larger and more expensive scopes. Jeremy said about the AT65EDQ, "this scope is great." So is Jeremy's image.

Can you take images as good as these with a 65mm scope? At the low price of the AT65EDQ it won't cost you a fortune to try your hand at wide field astrophotography.

Other manufacturers often use FPL-51 ED glass or its equivalent in their more-expensive triplet designs to keep their manufacturing costs down, or use FPL-53 in a simple doublet. In comparison to this approach, Astro-Tech uses a more-expensive true FPL-53 ED (Extra-low Dispersion glass) element in the triplet objective lens of the modestly-priced AT65EDQ. The result is the finest possible control of spurious color, for images that are free of all vestiges of the annoying faint color halos around bright objects visible in lesser scopes. In addition, a fourth lens of a proprietary ED type acts as a field flattener for wide field imaging.

Those exceptional optics are even more impressive when you consider the package they come in. The finely-machined AT65EDQ has a dual speed 2" rack-and-pinion focuser with a microfine 10:1 fine-focusing ratio. The standard equipment camera angle adjuster rotates a full 360° for the most pleasing photographic compositions. The supplied 2" and 1.25" accessory holders use non-marring brass compression rings that won't scratch your accessory barrels.

If this Astro-Tech AT65EDQ was simply a top-quality 65mm FPL-53 ED doublet system, it would be fairly priced. But - a 65mm fast focal ratio quadruplet astrograph using true FPL-53 glass, with a dual-speed 2" rack and pinion focuser and a built-in ED field flattener at this price . . . is the kind of super value only Astro-Tech can give you!

Features of this Telescope . . .

Apochromatic quadruplet ED refractor optics: the objective lens is a 65mm (2.56") aperture, 420mm focal length, f/6.5 focal ratio triplet using an element of high quality FPL-53 ED (Extra-low Dispersion glass) to reduce spurious color halos and fringing to vanishingly low levels. In addition, there is a separate ED glass singlet lens at the rear of the optical tube that acts as a field flattener to eliminate the curved field typical of fast focal ratio doublet and triplet refractors. Stars are focused and point-like to the edges of the field. This built-in field flattener eliminates the need to buy the separate external field flattener that most refractors need to provide flat field images.

Fully multicoated optics: All lenses have the latest state-of-the-art antireflection multicoatings matched to their glass types on all air-to-glass surfaces for high light transmission and excellent 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 a neighbor's backyard security light. The 4.75 pound AT65EDQ measures a very compact 13" long with the dew shield retracted, and is only 14.25" long with it extended.

Dual speed 2" rack-and-pinion focuser with 2" accessory holder and 1.25" accessory adapter, both with compression rings: The precision-made rack-and-pinion focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with 10:1 reduction gear fine focusing ratio. This provides exceptionally precise image control during critical DSLR or 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 2" focuser drawtube terminates in a built-in camera angle adjuster as standard equipment. It is not an optional extra-cost accessory, as it is with some other scopes. The camera angle adjuster lets you rotate the 2" accessory holder to line up a camera in either a landscape or portrait orientation (or any orientation in between). A knob on the camera angle adjuster lets you lock the focuser at whatever angle provides the most pleasing photographic composition.

The 62mm (2.44") travel 2" diameter focuser drawtube has a scale marked in 1mm increments so you can note individual focuser positions for easy return to the approximate correct focus when switching between visual use and photography or when switching between cameras. A lock knob under the focuser lets you lock in your photographic focus. The dual thumbscrew 2" drawtube has a 2" accessory holder that uses a non-marring soft brass compression ring to hold 2" accessories in place. The compression ring won't scratch the barrel of your accessories as an ordinary thumbscrew can.

A standard equipment 1.25" accessory adapter slips into the 2" accessory holder to let you use a 1.25" star diagonal, image erecting diagonal, or photo accessories. Like the 2" accessory holder, the 1.25" adapter also uses a non-marring soft brass compression ring to hold 1.25" accessories in place. If you are partial to 1.25" eyepieces and need an outstanding diagonal for this scope, consider the Astro-Tech 1.25" dielectric diagonal (#AT1D). It's a Sky & Telescope Hot Product for 2007. Most 2" star diagonals will not reach infinity focus with the AT65EDQ with either 1.25" or 2" eyepieces, so a 1.25" diagonal is recommended for visual use.

Tube finish: The optical tube and lens shade are finished in a durable textured powder coat, the same as that used on scopes three times the price of the AT65EDQ. The focuser and trim are black anodized.

Tube rings and dovetail: The AT65EDQ comes with a pair of felt-lined 80mm hinged split mounting rings with 1/4"-20 thread mounting holes in the top and bottom of each ring, plus a Vixen-style dovetail. Supplied mounting bolts let you install the rings on the supplied dovetail or on an optional Losmandy-style "D-plate" dovetail for using the AT65EDQ on an equatorial mount. They will also let you attach the rings to optional Vixen- or Losmandy-style dovetail adapters for piggybacking the AT65EDQ on top of a larger scope. A 1/4"-20 thread mounting hole in the Vixen-style dovetail will let you mount the AT65EDQ on an optional standard photo tripod for use as a terrestrial spotting scope or telephoto lens.

Other supplied accessories: A slip-on metal dust cap is standard. There is a dovetail shoe on the upper left side of the optical tube for installing an optional multiple reticle red dot finder such as the Astro-Tech #ATF, using a #ATFBV base.

Tech Details

Aperture 2.6"
Binary and Star Cluster Observation No
Focal Length 420mm
Focal Ratio f/6.5
Galaxy and Nebula Observation No
Heaviest Single Component 4.75 lbs.
Highest Useful Magnification 140x
Lunar Observation No
Weight 5.65 lbs.
Planetary Observation No
Resolution 1.78 arc seconds
Telescope Type Refractor
Visual Limiting Magnitude 11.6
Warranty 1 year


Review by:
I've had this scope for several years and I'm the second owner. I love the wide field views with my Canon 6D. I can use a lightweight cg-4 GEM and get 2-3 minute unguided exposures . I don't need long guided exposures at this focal length. Great for a grab and go scope, solar imaging, wide field shots, etc. (Posted on 10/31/2019)
Review by:
For my use, the AT65EDQ 65mm has only one significant problem... I SOLD MINE and hate myself for it.

Optically and mechanically it performs well beyond it's cost. I used it for deep field astrophotography hanging an SBIG ST8300M with color filter wheel on it and it held focus well in any position. Focusing is crisp although I would reduce the fast/slow ratio to 1:5. Images are sharp to the edges of my camera field and well color corrected.

Mine was piggybacked on a permanently mounted 10" LX200GPS and also used as a guide scope. Since I decided to concentrate on longer focal length imaging, I replaced the 65mm with a TeleVue Pronto which is 25 years old and the equal the AT65 in every way but color correction. Hadn't realized how much I enjoyed wide field imaging when I decided to concentrate on asteroids.

DON'T SELL YOURS or you'll end up like me, alone at night in a small building in your back yard singing "the Blues". (Posted on 8/4/2017)
Review by:
a awesome refractor (Posted on 8/4/2017)
Review by:
I have this in ADM rings piggyback on the AT6RC. Its great to have it in alignment with the RC and check out the differences in the apo vs. RC views. More wide field of course but the views are so crystal clear it is amazing. I use it with a Canon DSLR for images and Orion Neb came out so good for my first astrophotos using good equipment. I would reccomend this over the 70mm refractor even though it costs more. Reason I think so is because I have a 70mm Stellarvue which is good but has false color and color fringe compared to the 65EDQ. Wait list is well woth the wait, go for it. (Posted on 8/4/2017)
Review by:
I purchase this little gem close to three years ago and have pleased with its performance. I have this piggybacked on a ES127 Triplet, mounted on a CI700 mount. It alternates from being a guide scope to being the main imager. Imaging from this scope has resulted in a fairly flat field, elongation of stars barely discernible upon magnification, at least, to my eyes. I would purchase this product again. (Posted on 8/4/2017)
Review by:
Absolutely LOVE my AT65EDQ!! It is simply an excellent little astrograph with superb optics. I own a couple SCT's and a couple newtonians but this is my first apo refractor. I bought it for wide field imaging and I am 99% satisfied with my little apo. The only complaint is I get image shift when locking down the focuser. I use FWHM on BackYardEOS and it messes with my focusing when the image shifts. That withstanding, this scope still rates a solid 5 stars. I am perhaps spoiled now with my Moonlite focuser with shaft lock. I recommend this scope all the time for beginners or seasoned vets looking for a wide field imaging scope. Here are some links to images I took with this scope and I only used a CG5 mount on each of them. I dont ever feel the need to bring out the CGEM DX to image with scope. Thanks Astronomics for an excellent little imaging scope! (Posted on 8/4/2017)
Review by:
This is a solid performer with a great field of view, excellent flat field optics and a very sound and solid focuser. The craftmanship leaves nothing to be desired. The light path in a 2 inch diagonal is a little long for most EP's, especially most 1.25 inch. Look to Cloudy Nights for threads on which EP's and diagonals work best, or just stick to a 1.25 inch diagonal and EP's and your all set for visual.
The scope excels at flatfield imaging at 420mm. Great value. (Posted on 8/4/2017)
Review by:
These are great scopes and sell very fast! I bought my scope, with five in stock, and they were all sold that later that week. The reviews and images you find on the internet are great. Astrobin has a good collection of images from this scope.

With the full moon centered in the eyepiece (yes some pieces work), I didn't notice any faults with the optics. I was able to use a 14mm 100 degree eyepiece without a 50mm extension tube.

Great scope for the money! (Posted on 8/4/2017)
Review by:
I have zero complaints about the AT65EDQ. It's pound for pound prowess is unsurpassed at $600. Very solid construction with a pretty strong focusing mechanism. My images have been very good on color and the f6.5 speed is very nice to have at my disposal. It would be nice to have a focal reducer to drop it into the 4's, but the lack of that does not take away from this bargain. I would have paid $1,000.00 if I had to. (Posted on 8/4/2017)
Review by:
Pretty impressed, so far. This scope is built well above its price range. The overall weight is impressive, the focuser is robust enough to hold a DSLR without slipping, and the optics are absolutely incredible.
As a wide-field imaging scope, you will be hard-pressed to find a more complete package for the $$$ (remember - this one has a field flattener built-in!). The AT65EDQ delivers incredibly flat, detailed subs with my Canon XSi. The only real drawback here is the light gathering power of a 65mm aperture, combined with a not-so-fast f/6.5 optical system. Sure, it doesn't matter with autoguided wide-field images, but you still might consider a 0.8x focal reducer if you're battling light pollution or trying for smaller targets.
As a visual telescope . . . it actually works. My 21mm Baader Hyperion comes to focus without adding any extra back-focus. I would try something else, but this is a wide-field scope, so I want wide-field images! Never thought I would have an imaging scope that would also work as a grab-n-go on a sturdy tripod, but . . . yep.
In conclusion, the refractor guys can keep their Taks and APs . . . I'll stick with my AT65EDQ! (Posted on 8/4/2017)
Review by:
This is my first Imaging Refractor... I have used C8, C9.25, 6" SN, and just aquired a 10" SN.

My first night out I am impressed with the round stars edge to edge / corner to corner of my Canon APS-C sensor.

Complaints not worth a star:

*The front lense cap falls off if the scope is angled down.. but it slips on easy for Dark frames.

*Also there is reflective plastic on the edge of the dew shield I think it picked up some light from nearby lights next door. So I think I will get a small extension dew shield.

*You will need a 50mm extension to reach eyepiece focus.. this ships ready for AP. (Posted on 8/4/2017)
Review by:
Nice refractor. I took these images through the refractor with a Pentax K5 and 0.8 focal reducer for refractors.

Mike Cain (Posted on 8/4/2017)
Review by:
This scope has been a great addition to my imaging line-up. The focuser holds my Canon 1000D with ease and is very sturdy. The optics are first rate. I highly recommend this scope for the beginning or advanced imager! (Posted on 8/4/2017)
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Supplied Accessories

  • Dust covers
  • Tube rings
  • Vixen-style dovetail
  • Rotating camera angle adjuster
  • 2" and 1.25" compression ring accessory holders
  • Finder scope mounting shoe