HAC125DX
Sky-Watcher
From ~$871.21
2 stores
The Sky-Watcher HAC125DX is a compact catadioptric minigraph featuring the proprietary Honders Advanced Catadioptric (HAC) optical design, delivering an exceptional f/2 focal ratio that enables astrophotography 5x faster than conventional f/4.9 optics. This ultra-portable 8.4-pound astrograph combines a 125mm aperture with a 250mm focal length, making it ideal for widefield imaging of deep-sky objects with compact, lightweight equatorial mounts. The HAC optical design incorporates hybrid refractive and reflective elements with a collimatable Mangin mirror and HTMC-coated corrector plate, producing sharp, diffraction-limited images across a 16mm image circle optimized for modern CMOS sensors like the IMX533 and IMX585.
Specifications
| Focal length | 250 mm |
| Weight | 8.4 lb |
| Corrector Coating | High Transmission Multi-Coatings (HTMC) |
| Collimatable Cell | ✓ |
| Optical design | Honders Advanced Catadioptric (HAC) |
| Primary Mirror Type | Mangin Mirror |
| Secondary Obstruction Area | 0.425 |
| Aperture Diameter | 125 mm |
| Tube Diameter | 6.3 mm |
| Mirror Reflectivity | 0.94% |
| Focuser Type | Rear Primary Mirror Helical Focuser |
| Mounting Hardware | Clamshell Rings with V-style Dovetail |
| Back Focus Distance | 12.5 mm |
| Finder Scope | Dual Finder Scope Brackets |
| Included Accessories | 1.25-inch Adapter, M42x0.75 Adapter, Dew Shield |
| Tube Length | 15.7 mm |
| Mirror Coating | Radiant Aluminum Quartz (RAQ) |
| Optical Quality | Diffraction Limited (1/4 wave) |
| Focal ratio | f/2 |
| Image Circle | 16 mm |
| Secondary Obstruction Diameter | 53 mm |