Sky-Watcher SKU: S11520 | Helix SKU: CTS11520
SKU | S11520 |
UPC | 050234115209 |
Optical Info | |
---|---|
Optical Design | Mak-Cass |
Mirror Coatings | 94% Aluminum |
Lens Coatings | Fully Multi-Coated |
Glass Type | BK7/Borosilicate |
Primary Aperture (mm) | 127 |
F/Ratio | 12.1 |
Focal Length (mm) | 1540 |
Secondary Diameter | 39mm |
Secondary Obstruction (by diameter) | 31% |
Secondary Obstruction by Area | 9% |
Observational Info | |
Dawes Limit | 0.91 |
Rayleigh Limit | 1.1 |
Limiting Mag. | 13 |
Minimum Magnification | 18 |
Maximum Magnification | 250 |
Light Gathering (compared to next size down) | 55% |
General Info | |
Focuser | Primary Mirror |
OTA Length (Retract/Ext.) | 15" |
OTA Outer Diameter | 5.75" |
OTA Weight (with accessories) | 9.7 |
Accessories | |
Included Finder | 6x30 Finder |
Included Diagonal | 2" Star Diagonal |
Mounting Accessories | V-Rail |
Included Eyepieces | 28 LET |
Magnification w/ Included Eyepieces | 55x |
Included Case | No |
Corrector | No |