Sky-Watcher SKU: S11510 | Helix SKU: CTS11510
| SKU | S11510 |
| UPC | 050234115100 |
| Optical Info | |
|---|---|
| Optical Design | Mak-Cass |
| Mirror Coatings | 94% Aluminum |
| Lens Coatings | Fully Multi-Coated |
| Glass Type | BK7/Borosilicate |
| True Aperture (mm) | 101.93 |
| Primary Aperture (mm) | 102 |
| F/Ratio | 12.7 |
| Focal Length (mm) | 1300 |
| Secondary Diameter | 31mm |
| Secondary Obstruction (by diameter) | 30% |
| Secondary Obstruction by Area | 9% |
| Observational Info | |
| Dawes Limit | 1.14 |
| Rayleigh Limit | 1.37 |
| Limiting Mag. | 12.5 |
| Minimum Magnification | 14 |
| Maximum Magnification | 201 |
| Light Gathering (compared to next size down) | 28% |
| General Info | |
| Focuser | Primary Mirror |
| OTA Length (Retract/Ext.) | 12.25 |
| OTA Outer Diameter | 4.625" |
| OTA Weight (with accessories) | 4.6 |
| Accessories | |
| Included Finder | Red Dot |
| Included Diagonal | 1.25" Star Diagonal |
| Mounting Accessories | V-Rail |
| Included Eyepieces | 25/10 Wide Angle |
| Magnification w/ Included Eyepieces | 52x/130x |
| Included Case | Yes |
| Corrector | No |