Astronomy magazine called it "a product everyone should own." Years of strong owner reviews — and a following of people who bought a second one when their first proved indispensable — suggest the magazine knew what it was talking about. The AT72EDII is a 72mm f/6 ED doublet with FPL-53 and Lanthanum glass — premium optics that deliver virtually zero chromatic aberration at this aperture and focal ratio. At 430mm focal length, it's fast enough for wide-field deep-sky imaging, compact enough to travel in a backpack, and sharp enough to deliver rewarding views of everything from the Moon and planets to rich star fields and bright deep-sky objects. But the real story is versatility: this scope does imaging, guidescoping, lunar-planetary visual, and grab-and-go observing so competently that it often ends up being the last scope people think they'll sell.
The "II" in the name is important. The AT72EDII uses the EDT-series focuser mechanism — the same dual-speed 2-inch rack-and-pinion with 10:1 fine focusing and camera angle adjuster you'll find in the much larger AT115EDT and AT130EDT. That's a significant step up from the original AT72ED. The CAA lets you rotate your camera for framing without touching focus. The focuser is smooth and precise enough for critical work. And the whole scope comes bundled with a complete package: non-marring compression ring holders, two CNC tube rings, and a Vixen dovetail plate — a more complete mechanical setup than most scopes at this size.
The retractable dew shield extends to protect the objective in humid conditions, then retracts and stores against the tube for travel. At 4.8 pounds, the whole assembly fits on a small equatorial mount for imaging, on a photo tripod for a quick visual session, or piggyback on a larger scope for guided autoguiding. For travelers, observers with limited space, and imaging enthusiasts who want a serious secondary imaging scope without the weight, the AT72EDII solves a real problem.
The Optical Design
FPL-53 and Lanthanum glass — premium Ohara ED elements with full multicoating on every air-to-glass surface. This is the glass that makes a small refractor shine. At 72mm aperture and f/6, the doublet design delivers color correction that exceeds expectations for its aperture and price class. You will see essentially no false color on Jupiter, Saturn, or the Moon. On bright stars at high power, the star remains pinpoint tight. Internal knife-edge baffles and blackened lens edges contribute to the deep, dark sky backgrounds this aperture is known for. The focuser threads are sealed against dust and dew, and the internal mechanics are built for the precision that astrophotography demands.
The 430mm focal length is a carefully chosen sweet spot. At f/6, it's fast enough to gather light quickly for imaging — useful when you're shooting faint nebulae or working in less-than-perfect suburban skies. But it's not so fast that eyepiece aberrations become a factor in visual work. The f-ratio is forgiving on eyepiece quality, which means even entry-level eyepieces will show you good views. For astrophotography, the focal length is short enough to frame wide fields (perfect for emission nebulae, open clusters, and large galaxies), yet long enough to deliver meaningful magnification on the planets.
The Focuser
This is where the AT72EDII shows its design maturity. The EDT-series 2-inch rack-and-pinion focuser has two knobs: a coarse focus ring for rapid positioning and a concentric 10:1 fine-focus microknob for critical focus work. Both operate smoothly. The friction is just right — not tight enough to bind, not loose enough to creep when you're holding weight. The camera angle adjuster (CAA) is built in: loosen the control knob on the focuser housing, rotate your camera head to any angle for composition, then tighten. This is essential for imaging when your camera orientation and your mount's travel axes don't align naturally. No need to refocus after framing — the CAA isolates camera rotation from the focus position.
The focuser travel is optimized for both 2-inch and 1.25-inch accessories. The drawtube extension reaches enough to accommodate a 2-inch diagonal with a camera, or a 2-inch eyepiece, or a Barlow in the 1.25-inch draw without running out of focus. The travel is smooth at both coarse and fine scales, with none of the jumpiness or play that cheaper focusers introduce.
The compression ring holders on both the 2-inch and 1.25-inch barrels use soft brass rings rather than a thumbscrew biting directly into the barrel. This means your eyepieces and diagonals stay unmarked through years of swapping and adjusting. It's a small detail that pays dividends if you're the type who rotates eyepieces across different scopes.
Built for the Field
At 72mm and f/6, the AT72EDII is the opposite of a bulky observatory scope. The optical tube itself is only 12 inches long (15 inches with the dew shield extended) — small enough that you can rest it on a car door or on foam with one hand. The whole assembly with rings and dovetail weighs 4.8 pounds. This isn't a scope you need a car to transport. It travels in a backpack. It lives in a closet without complaint. It lives on a small equatorial mount without exceeding payload limits. For observers in apartments, RVs, or small observatories, or for anyone who travels to dark sites, the size and weight are genuine advantages.
The two tube rings are CNC-machined with a Vixen dovetail plate pre-installed. This is not a finder ring with a 1/4"-20 threaded foot — it's a full-size Vixen dovetail that accepts any Vixen-compatible saddle. That means you can mount the AT72EDII on an HEQ5-class equatorial, a Celestron CGX, or a Losmandy dovetail-to-Vixen adapter. The rings are split so you can remove the scope without removing the dovetail from the mount. Felt-lined rings protect the tube finish.
The retractable dew shield extends the tube to 15 inches total and shields the objective lens from dew and stray light. The design is self-storing — the shield slides down over the tube and stays there until you extend it. This is elegantly practical. You get dew protection on humid nights without adding bulk during transport.
The whole setup is fast to assemble: insert the scope into the rings, tighten the ring locks, attach your diagonal and eyepiece, and you're observing within minutes. No tools required. No balancing act with heavy counterweights. No complex setup procedures. This is why the AT72EDII ends up being the first scope people grab when they have 30 minutes before sunset and want to catch the Moon or a bright planet.
What's Included
- Astro-Tech AT72EDII 72mm f/6 FPL-53 + Lanthanum ED doublet refractor OTA
- Two CNC tube rings with felt lining
- Vixen dovetail plate pre-installed on rings
- 2" eyepiece holder with non-marring compression ring
- 1.25" adapter with non-marring compression ring
- Retractable, self-storing dew shield
- Metal dust cap for objective
- Eyepiece holder dust seal
Features
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72mm (2.83") FPL-53 + Lanthanum ED doublet optics — Premium Ohara ED glass. Virtually zero chromatic aberration. The optical quality usually found in scopes costing twice as much.
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f/6, 430mm focal length — Fast enough for efficient deep-sky imaging, slow enough to be forgiving on eyepiece quality. Wide-field frames, tight planetary magnification, grab-and-go versatility.
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EDT-series 2" dual-speed rack-and-pinion focuser — 10:1 fine focus. Smooth action, zero creep, built for both visual and camera work.
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Built-in camera angle adjuster — Rotate your camera for composition without losing focus. Standard equipment, not an extra purchase.
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Non-marring compression ring holders — 2" and 1.25" accessories secure without scratching or binding.
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Vixen dovetail mounting — Full-size dovetail with two CNC tube rings. Accepts any Vixen-compatible saddle. Professional mounting out of the box.
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Retractable dew shield — Extends for humid nights, retracts for compact storage and transport. Self-storing design.
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Knife-edge internal baffles — Deep contrast and dark sky backgrounds. Blackened lens edges reduce scattered light.
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Compact and portable — 4.8 pounds with rings and dovetail. 12-inch tube. Fits a backpack. Mounts on small equatorial drives without exceeding payload limits.
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Award-winning design — Astronomy magazine endorsement and years of strong owner reviews. Returned to by observers who thought they'd moved past it.
Under the Night Sky
The Moon is where the AT72EDII proves that you don't need a large aperture to see detail. At 72x (12mm eyepiece), the terminator is alive with shadow detail — crater walls catching the first light, the central peaks of young craters in sharp relief, the scarps cutting across ancient mare floors. The Straight Wall casts a knife-edge shadow near quarter phase. Rilles thread across the lunar surface like fine lines drawn with a pencil. At higher powers — 100x to 143x on the best nights — individual mountain peaks stand out in three dimensions. No false color. No haze across the detail. Just clarity. This is why refractors dominated lunar observation for centuries.
Jupiter shows its two main equatorial belts clearly, along with changing moon positions and occasional transit events. Saturn's ring system is beautifully defined, and under steady skies the Cassini Division becomes visible. The Moon is especially rewarding, revealing crisp crater walls, rilles, mountain ranges, and subtle shadow detail.
For double stars, the AT72EDII's 1.61 arc-second resolution cleanly splits the bright pairs. Albireo (beta Cygni) separates into gold and blue at any magnification. Epsilon Lyrae, the Double Double, is more challenging at 72mm — the close pair of the quad resolves with effort at 143x on good seeing nights, but you'll definitely see the close pair as separate. For visual double-star observers, the AT72EDII provides enough resolution to hunt interesting pairs while remaining portable enough to set up in minutes.
Deep-sky objects are real but bounded by aperture. The Ring Nebula (M57) shows its annular shape clearly at low power. M13 (the Hercules Cluster) resolves to individual stars across the face, with many more just beyond resolution. The Andromeda Galaxy shows the bright core and extending disk at low power; dark lanes are visible on a good night at 50-60x. The Double Cluster in Perseus is a showpiece — dozens of stars scattered across the field with a clarity that only a refractor delivers. The Pleiades, the Hyades, and the Beehive Cluster all shine. What you won't do: hunt the faintest faint galaxies, explore the deep structure in large nebulae, or collect photons from objects below magnitude 13. For that, supplement with a larger reflector. The AT72EDII is not trying to be everything. It's trying to be excellent at what 72mm ED refractors do best.
Community Says
The AT72EDII has a devoted following on Cloudy Nights — the forum Astronomics owns — and the honest enthusiasm there tells the story better than any spec sheet. Owners are clear-eyed about what a 72mm is and isn't, then pleasantly surprised by what it does anyway.
"No one is ever going to call my little f/6 scope a planet killer. That's not its intended design — it's meant for wide field. But... at 108x, the views along the lunar terminator were super crisp and detailed. The sharp edges of mountains, ridges and craters in the waxing crescent Moon were great. Venus revealed itself as a very pristine crescent."
— Cloudy Nights "planets are small, but spectacular" discussion. This owner was working the Moon and Venus with a Barlow and a zoom eyepiece.
"The first time I looked at Jupiter with mine I was shocked how well it did. Even though it looked small, it was sharp — some belts, and the crisp shadow of a moon's transit looked close to how my 92 Stowaway did on the same evening."
— Cloudy Nights AT72EDII discussion. This owner compared it directly against a premium 92mm apochromat costing several times the price.
The recurring theme: nobody buys a 72mm doublet expecting a planet killer, and nobody seems to come away disappointed by what this one shows.
Observing Tip
For visual observing, pair the AT72EDII with a quality 2-inch low-power eyepiece and spend time exploring large star fields. The combination of a 430mm focal length and excellent color correction makes this telescope particularly rewarding on objects like the Double Cluster, the Pleiades, the Beehive Cluster, and the larger star clouds of the Milky Way. Many owners discover that these sweeping views become the telescope's most memorable strength.
FAQ
How does the AT72EDII compare to the AT60ED?
Both use FPL-53 + Lanthanum glass. Both are compact and portable. The AT72EDII has more aperture (72mm vs. 60mm), which translates to about 44% more light-gathering. Both are f/6, but the AT72EDII's longer 430mm focal length (vs. 360mm) gives more image scale and reach. The AT72EDII includes two tube rings and a Vixen dovetail; the AT60ED uses a finder ring with 1/4"-20 threaded foot. If you want the absolute minimum size and weight, the AT60ED. If you want notably more capability without much more bulk, the AT72EDII is the clear choice.
How does the AT72EDII compare to the AT70ED?
Different glass, different focuser. The AT72EDII uses FPL-53 + Lanthanum with the EDT-series dual-speed focuser and camera angle adjuster. The AT70ED uses FK-61 (FPL-51 equivalent) glass with a simpler single-speed focuser and no CAA. The AT72EDII delivers better color correction and more imaging-friendly mechanics — the CAA and fine-focus control make critical focus work easier. The AT70ED costs less and is still a solid scope. The AT72EDII is the premium version in the compact category.
What's the difference between the AT72EDII and the original AT72ED?
The AT72EDII upgraded the focuser to the EDT-series mechanism with 10:1 fine focus and a camera angle adjuster. It switched to non-marring compression ring holders. It added proper tube rings and a Vixen dovetail (the original had a simpler mounting foot). The optics are the same FPL-53 + Lanthanum design — the upgrades are all mechanical. If you have an original AT72ED, the "II" version is an evolution worth considering if you're serious about imaging.
Is this good for astrophotography?
Absolutely. At 430mm f/6 with the EDT-series focuser and camera angle adjuster, it's one of the best small-aperture imaging scopes available. The fast focal ratio means shorter exposures. The focal length is perfect for wide-field emission nebulae and open clusters. Add the ATRF72 0.8x reducer for even faster imaging at f/4.8. The non-marring compression rings and smooth focuser make the workflow straightforward. Many serious imaging observers keep this as a dedicated secondary camera system even after acquiring much larger scopes.
What kind of mount do I need?
For visual use, lightweight alt-azimuth mounts such as the Astro-Tech Voyager, Sky-Watcher AZ-GTi, or similar mounts work very well. For imaging, mounts in the HEQ5, AM3, or Sirius class provide more than enough capacity.
Optional Accessories
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ATRF72 0.8x Reducer/Flattener — Drops the focal ratio to f/4.8 and the focal length to 344mm. For faster deep-sky imaging with a wider field and flat, corrected stars across APS-C sensors. The serious secondary imaging scope choice. Sold separately.
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Astro-Tech 2" 99% Reflectivity Dielectric Mirror Diagonal — The companion diagonal for visual work. Dielectric coatings reflect more light than standard aluminum. The wider bore handles the field of view the AT72EDII can deliver. Sold separately.
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Astro-Tech Eyepieces — Pair this scope with AT eyepieces: UWA 82° series (4mm, 7mm, 10mm, 13mm, 16mm, 21mm, 28mm), PF series (5.5mm, 10.5mm, 15.5mm, 19mm, 25mm), or the 9-27mm zoom. The fast focal ratio is forgiving on eyepiece quality. Start with a 25mm for low power and a 10mm for medium magnification. Sold separately.
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Astro-Tech 2x Telecentric Barlow — Double your eyepiece magnifications without changing optical quality. Excellent for planetary work and double-star observation. Sold separately.
Specifications
Final Thoughts
The AT72EDII is the scope that makes people rethink the limits of small refractors. FPL-53 glass, an EDT-series focuser with camera angle adjuster, a complete mechanical package with Vixen dovetail and tube rings, and a total weight of 4.8 pounds — it's built for imaging, built for visual, and built for travel. Years of strong owner reviews and an Astronomy magazine endorsement ("a product everyone should own") aren't accidents. Grab it for a quick visual session on the Moon. Mount it for deep-sky imaging. Use it as a guidescope on a larger rig. In five years, you'll still be reaching for it—which is ultimately the best measure of a telescope's value.
