Sky-Watcher SKU: S11530 | Helix SKU: CTS11530
| SKU | S11530 |
| UPC | 050234115308 |
| Optical Info | |
|---|---|
| Optical Design | Mak-Cass |
| Mirror Coatings | 94% Aluminum |
| Lens Coatings | Fully Multi-Coated |
| Glass Type | BK7/Borosilicate |
| True Aperture (mm) | 151 |
| Primary Aperture (mm) | 166 |
| Primary Edge Thickness | 12.5mm |
| F/Ratio | 12 |
| Focal Length (mm) | 1800 |
| Secondary Diameter | 47mm |
| Secondary Obstruction (by diameter) | 31% |
| Secondary Obstruction by Area | 10% |
| Observational Info | |
| Dawes Limit | 0.77 |
| Rayleigh Limit | 0.93 |
| Limiting Mag. | 13.4 |
| Minimum Magnification | 21 |
| Maximum Magnification | 295 |
| Light Gathering (compared to next size down) | 40% |
| General Info | |
| Focuser | Primary Mirror |
| OTA Length (Retract/Ext.) | 17.5" |
| OTA Outer Diameter | 7.5" |
| OTA Weight (with accessories) | 14 |
| Accessories | |
| Included Finder | 9x50 Finder |
| Included Diagonal | 2" Star Diagonal |
| Mounting Accessories | V-Rail |
| Included Eyepieces | 28 LET |
| Magnification w/ Included Eyepieces | 64.3x |
| Included Case | No |
| Corrector | No |