The William Optics Zenithstar 81 is a two element designed APO refractor.
Using FPL-53 glass this telescope provides excellent aberration correction.
Features include:
- Smooth, stable and reliable rack and pinion 2.5″ focuser
- Built-in Bahtinov mask
- CNC Handle bar with dovetail slot
- Soft carry case is included
Specfications:
| Focal Length | 559mm |
| Diameter | 81mm |
| Aperture | F6.9 |
| Camera Format | APS-C, Full Frame |
| Focuser | 2.5″ Rack and Pinion |
| Image Circle | 44mm |
| Recommended Flattener | FLAT 6A III |
| TubeLength (Retracted) | 460mm |
| TubeLength (Extended) | 560mm |
| OTA Weight | 3.53kg |
