OTA · 2021–
Vixen SD81SII
Key specifications
| Aperture | 81 mm |
|---|---|
| Focal length | 625 mm |
| Focal ratio | f/7.7 |
| Optical design | ED Doublet |
| Weight | 2.3 kg |
All specifications
| Lens coating | AS Coating |
|---|---|
| Focuser type | Rack-and-pinion, with lock knob |
| Tube length | 585 mm |
About
81mm f/7.7 SD-glass (FPL-53) doublet apochromatic refractor; 'photo-visual' tube with shortenable design and 60mm drawtube thread.