Product Description
THIS PRODUCT HAS BEEN DISCONTINUED. THIS PAGE IS HERE FOR INFORMATIONAL PURPOSES ONLY.
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 |
Reviews
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)
http://www.astrobin.com/35409/
http://www.astrobin.com/33839/
http://www.astrobin.com/31650/C/
http://www.astrobin.com/31649/D/ (Posted on 8/4/2017)
The scope excels at flatfield imaging at 420mm. Great value. (Posted on 8/4/2017)
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)
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)
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)
https://plus.google.com/photos/111606611049125551009/albums/5801507166489500193
Mike Cain (Posted on 8/4/2017)
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