Takahashi TSA-120 specifications
Optical specifications
| Spec. | TSA-120 |
|---|---|
| Optical design | Triplet Super Apo |
| Optical mounting | Air spaced |
| Glass types | ED et Crown |
| Optical coatings | Multicouche BBAR (BroadBand anti-reflection) |
| Aperture | 120mm |
| Standard | |
| Focal length | 900mm |
| Focal ratio | F/7.5 |
| Resolution | 0.97" |
| Visual limiting magnitude | 12.1 |
| Light grasp | 293x |
| Image circle | NA |
| Photo field | NA |
| With TOA35-FL field flattener | |
| Focal length | 882mm |
| Focal ratio | F/7.3 |
| Image circle | 40mm (60% non-vignetted) |
| Photo field | 2.6° @ 40mm image circle |
| Spot sizes | 7µm RMS @ center of field 7µm RMS @ 10mm off-axis 7µm RMS @ 20mm off-axis |
| With TOA35-RD reducer | |
| Focal length | 672mm |
| Focal ratio | F/5.6 |
| Image circle | 40mm (60% non-vignetted) |
| Photo field | 3.4° @ 40mm image circle |
| Spots size | 4µm RMS @ center of field 6µm RMS @ 10mm off-axis 13µm RMS @ 20mm off-axis |
Mechanical specifications
TSA-120 - Longitudinal view (lengths in mm) of the rack-and-pinion focuser
Specifications
| Spec. | TSA-120 | |
|---|---|---|
| Tube length (mini/maxi) | 990mm | |
| Tube diameter/dew-shield diameter | 125mm/160mm | |
| Tube weight | 6.7 kg | |