OTA · 2008–
Takahashi TSA-120
Key specifications
| Aperture | 120 mm |
|---|---|
| Focal length | 900 mm |
| Focal ratio | f/7.5 |
| Optical design | Triplet APO |
| Back focus | 227.5 mm |
| Weight | 6.7 kg |
All specifications
| Lens coating | Hard multicoatings |
|---|---|
| Focuser type | Rack-and-pinion |
| Tube length | 990 mm |
About
120 mm air-spaced ED triplet apochromat, 900 mm focal length at f/7.5. Three-element barrel for thermal/transport stability; chromatic correction roughly a third better than the legacy fluorite FS-102/FS-128, with ~99.2% Strehl at optimal wavelengths.