Product Overview
The all-new Honders Advanced Catadioptric, or HAC125DX Minigraph is the smallest, fastest astrograph you can find.
- Honders Advanced Catadioptric optical design
- Radiant Aluminum Quartz (RAQ)™ mirror coatings
- Wide-open 250mm focal length
- FAST f/2 focal ratio
- 5-inch aperture diameter
- Lightweight 8.4 pounds
- 16mm image circle
- Collimatable primary mirror cell
- Rear primary mirror heliacal focuser
- Clamshell rings with a V-style dovetail
- Dual finderscope brackets
- 1.25-inch barrel
- Included accessories: 1.25-inch adapter, M42x0.75
adapter, dew shield
The Honders Advanced Catadoptric optical design maximizes its glass with hybrid refractive and reflective surfaces to deliver the sharpest, fastest, lightest catadioptric mini astrograph (minigraph) available.
The Sky-Watcher Honders Advanced Catadioptric (HAC) telescope is a sophisticated, high-speed astrograph designed for fast, wide-field imaging in a compact package. Unlike other small refractor astrographs, the HAC125DX features a lightning-fast f/2 focal ratio allowing you to capture images 5x faster than a standard f/4.9 optic. With this kind of speed that means more data in less time and no need to autoguide!
Compared to the original HAC125 the HAC125DX features a rear focusing mechanism on the primary. This allows for a wider range of cameras to be used compared to the original model and makes focusing easier when the telescope is in use. The telescope features a 16mm image circle which is ideal for IMX533 and 585 cameras. While small, at only 15.7-inches long the HAC125DX offers a powerful imaging platform for both beginners and advanced imagers.
The HAC125DX is the ultimate grab-and-go astrograph. Fast optics and small size make it easier to get out and enjoy the hobby you love. Attach it to your favorite portable mount and you are ready to capture the universe in virtually no time at all! The HAC125DX is not just another astrograph, it’s a Minigraph that is ready for all your astronomy adventures.
The field of view with an IMX533 and IMX585 camera sensor. Consider a non-cooled model and take very short exposures.
Specifications
| SKU | S11250 |
| UPC | 810098970648 |
| Optical Specifications | |
|---|---|
| Optical Design | Honders Advanced Catadioptric |
| Mirror Coating | Radiant Aluminum Quartz (RAQ)™ Coatings |
| Reflectivity | 0.94 |
| Mirror Type (Monolithic/Conical/Fused conical) | Mangin |
| Corrector Coating | HTMC™ |
| Glass Type | Borosilicate |
| Primary Aperture (mm) | 125 |
| F/Ratio | 2 |
| Focal Length (mm) | 250mm |
| Image Circle | 16mm |
| Secondary Obstruction by Diameter | 53mm |
| Secondary Obstruction by Area | 0.425 |
| Primary cell supports (how many support points) | Rear Support |
| Optical Quality | Diffraction limited (1/4 wave) |
| Collimatable Cell | Primary |
| Mechanical Specifications | |
| Focuser Type | Primary focus |
| Focuser Size | Primary Mirror Helical |
| Focuser: Dual or Single Speed | Single |
| Compression Ring | No |
| Optical Tube length | 15.7 inches |
| Optical Tube diameter | 6.3 inches |
| Optical Tube weight | 8.4 pounds |
| Accessories | |
| Included finder | None |
| Mounting Hardware | Clamshell rings with V-style dovetail |
| Additional Accessories | 1.25" & M42x0.75 camera adapters |
| Manual | No |
| Case | No |
| Shipping Weight | 10 pounds |
| Shipping Dimensions | 19.3"x10.6"x11" |
| Observational Info | |
| Dawes Limit | 0.93 |
| Rayleigh Limit | 1.12 |
| Limiting Magnitude | 12.96 |
| Light Gather (compared to next size down) | 56% (compared to 100mm telescope) |
| Intended use | Imaging |
