Sky-Watcher HAC125DX Minigraph

Sky-Watcher has just dropped something really exciting for us backyard astrophotographers—the new HAC125DX Minigraph. This thing is a 5-inch, f/2 Honders astrograph, and it’s built for speed. I mean serious speed.

It’s compact, lightweight, and super portable—exactly what you want when you're setting up in your backyard, heading out to a dark sky site, or hitting a star party. This is the kind of telescope that lets you maximize your imaging time. You’re getting bright, wide-field images in way less time than you’d need with a traditional small refractor.

If you're like me and you love gear that just works—no drama, no fuss—this might be one to keep an eye on.

Sky-Watcher HAC125DX Minigraph: The ultimate grab-and-go astrograph

At its core, the HAC125DX Minigraph is a purpose-built astrograph optimized for fast, wide-field imaging. Unlike many portable refractors on the market, the HAC125DX features a lightning-fast f/2 focal ratio, allowing it to collect light nearly six times faster than a typical f/5 telescope. That kind of speed translates directly into shorter exposure times, often reducing image capture from minutes down to mere seconds. For astrophotographers, this opens up new possibilities, more subs in a shorter time frame, better use of limited imaging windows, and in many cases, no need for autoguiding at all.

The HAC125DX represents the next evolution in Sky-Watcher’s Honders Advanced Catadioptric lineup. It builds on the original HAC125 design but introduces several enhancements aimed at improving usability and performance. One of the most notable upgrades is the improved back focus, which allows the use of a broader range of astrophotography cameras. The telescope now supports the full use of its 16mm image circle, making it ideal for popular sensors like the IMX533 and IMX585. Another major change is the addition of a rear-mounted primary mirror helical focuser, replacing the original front helical system. This new design not only improves focusing precision but also simplifies cable management during imaging sessions.

Sky-Watcher has also added thoughtful design elements to make the HAC125DX easier to use in real-world imaging setups. The dew shield now includes a routing path that helps with organizing power and data cables, reducing tangles and improving overall cable discipline. At just 8.4 pounds and only 15.7 inches in length, the HAC125DX is incredibly portable. It pairs seamlessly with a wide range of lightweight equatorial tracking mounts such as the Star Adventurer GTi, the Sky-Watcher Wave series, and the all-new EQ-AL55i. This makes the HAC125DX a perfect grab-and-go imaging rig for mobile astrophotographers, travelers, and beginners looking for a powerful but easy-to-use astrograph.

What really sets the HAC125DX apart is its Honders Advanced Catadioptric optical system. Unlike traditional Newtonians or refractors, this optical design combines both reflective and refractive elements. The primary mirror is a Mangin design, which incorporates a lens element within the mirror itself to help correct aberrations. Paired with Sky-Watcher’s Radiant Aluminum Quartz (RAQ) mirror coatings and HTMC-coated corrector optics, the system delivers exceptional contrast and light throughput. The mirror coatings boast 94 percent reflectivity, helping preserve the speed and sharpness of the f/2 design. The HAC125DX offers diffraction-limited performance right out of the box, giving astrophotographers access to tack-sharp stars and excellent flat-field imaging.

With a native 16mm image circle, the HAC125DX is tailored for use with many of today’s most popular CMOS cameras. The IMX585 and IMX533 sensors are a perfect match, offering low noise, high resolution, and full sensor illumination with no vignetting. Sky-Watcher includes two camera adapters with the telescope, a 1.25-inch barrel adapter and a threaded M42x0.75 adapter. Both options feature internal threads that allow the use of 1.25-inch filters, whether for light pollution reduction, UV/IR control, or narrowband imaging. This flexibility means that users can adapt the HAC125DX to their imaging needs without purchasing extra accessories.

HAC125DX Minigraph specifications

• Optical design: Honders Advanced Catadioptric
• Mirror type: Mangin
• Primary aperture: 125mm (5 inches)
• Focal length: 250mm
• Focal ratio: f/2
• Image circle: 16mm
• Coatings: Radiant Aluminum Quartz (RAQ) mirror coatings, HTMC corrector coatings
• Reflectivity: 94%
• Optical quality: Diffraction limited (1/4 wave)
• Secondary obstruction (diameter): 53mm
• Secondary obstruction (area): 0.425
• Collimatable primary mirror cell: Yes
• Focuser type: Rear-mounted primary mirror helical focuser
• Focuser speed: Single-speed
• Compression ring: No
• Optical tube length: 15.7 inches
• Optical tube diameter: 6.3 inches
• Optical tube weight: 8.4 pounds
• Shipping weight: 10 pounds
• Shipping dimensions: 19.3 x 10.6 x 11 inches
• Mounting hardware: Clamshell rings with Vixen-style dovetail bar
• Included accessories: 1.25-inch adapter, M42x0.75 adapter, dew shield
• Finderscope brackets: Dual
• Intended use: Imaging
• Limiting magnitude: 12.96
• Dawes limit: 0.93 arcseconds
• Rayleigh limit: 1.12 arcseconds
• Light gathering compared to 100mm: 56% increase
• Price: $995
• SKU: S11250
• UPC: 810098970648
   

The smallest astrograph you can find: The HAC125DX Minigraph (Honders Advanced Catadioptric)

Mechanically, the HAC125DX is built to be as user-friendly as it is powerful. The telescope includes a clamshell mounting ring with a Vixen-style dovetail bar, allowing it to be mounted on a wide array of tracking platforms. It also features dual finderscope brackets for future accessory options or additional balancing solutions. Although it does not come with a finder scope or carrying case, its small size makes it easy to store or pack into a custom case for transport. The primary mirror cell is collimatable, which gives advanced users the ability to fine-tune alignment for optimal performance, though the telescope ships factory-aligned and ready to use.

Sky-Watcher is positioning the HAC125DX as the ultimate astrograph for wide-field imaging on the go. It is ideal for capturing large nebulae, star fields, and multi-frame mosaics without the weight or bulk of larger optics. Thanks to its fast optics and short focal length, it is also highly forgiving with regard to guiding and polar alignment. This makes it not just a telescope for experienced imagers, but also a valuable tool for newcomers who want to dive into astrophotography without dealing with steep learning curves.

Sky-Watcher plans to showcase the HAC125DX Minigraph at both the Northeast Astronomy Forum (NEAF) and Northeast Astro Imaging Conference (NEAIC), giving attendees a first look at this unique new telescope. The HAC125DX will be available for pre-order soon through authorized Sky-Watcher dealers and is priced at $995, making it one of the most accessible f/2 astrographs on the market.

Whether you are looking to expand your imaging capabilities or simply want a fast, lightweight telescope that can go anywhere and image anything, the Sky-Watcher HAC125DX Minigraph delivers. It redefines what a portable astrograph can be, combining modern optics, smart design, and imaging flexibility into a package that is ready for any sky.

Compared to the original HAC125 the HAC125DX features a rear focusing mechanism on the primary

To wrap up, the Sky-Watcher HAC125DX Minigraph offers a highly portable, high-performance imaging solution built around a 125mm aperture, 250mm focal length, and an ultra-fast f/2 focal ratio. It utilizes a Honders Advanced Catadioptric optical design with a Mangin primary mirror and premium RAQ and HTMC coatings for exceptional light throughput and image clarity. The native 16mm image circle makes it ideal for modern CMOS sensors like the IMX585 and IMX533, while the rear-mounted primary mirror helical focuser and collimatable cell add a professional level of control and precision. At just 8.4 pounds and 15.7 inches long, the HAC125DX is perfect for use with portable mounts and is easy to take on the road.

With a price of just $995, the HAC125DX delivers incredible value for anyone looking to capture wide-field deep sky targets quickly and efficiently. It includes both 1.25-inch and M42x0.75 camera adapters with internal filter threads, a dew shield with cable management support, and clamshell rings with a Vixen-style dovetail. Whether you are an experienced imager looking for a fast secondary scope or a beginner ready to jump into high-speed astrophotography, the HAC125DX Minigraph is a powerful, affordable, and compact tool that stands out in today’s imaging market.

Just Dropped! Sky-Watcher HAC125DX Mini Astrograph

Buy the Sky-Watcher HAC125DX Minigraph