TAKAHASHI TSA-120 APO TRIPLET
Takahashi
Apochromatic triplet
6.7 kg
TAKAHASHI TSA-120 APO TRIPLET - OTA Only is backordered and will ship as soon as it is back in stock.
The Takahashi TSA-120 is an apochromatic triplet refractor with exceptional correction for observation and astrophotography. With one S-FPL53 ED element, the air-spaced triplet lens cell provides similar performance to their flagship TOA series with a Strehl ratio of 99.2% at the optimal wavelengths of human vision.
The TSA-120 has a native focal length of 900mm and a focal ratio of f/7.5, making it the ideal instrument for capturing a wide range of deep sky objects.
A selection of three different field correctors are available to suit different applications (sold separately). With the optional TOA-35RD focal reducer, the telescope is transformed into a highly corrected astrograph with a large 44mm image circle. In addition, a 1.5x focal extender is available, also corrected for full-frame sensors.
The rack and pinion focuser is smooth and accurate. For serious imaging, the Prima Luce Lab Esatto 3" robotic microfocuser is compatible with the additional PL3600296 adapter. NOTE: Use of the optional focal reducers will likely require a custom adapter for the Esatto. Please contact us for more information.
Note: The OTA ONLY variant does not include tube rings or a dovetail bar. For the TSA-120, you can use the PrimaLuceLab 125mm PLUS tube rings in combination with the PrimaLuceLab 240mm Losmandy bar.
Specifications
| Optical design | Super apochromatic triplet with ED glass |
|---|---|
| Lens cell |
Air-spaced triplet with 3 lenses in 3 groups, 1 x S-FPL53 lens in the centre |
| Coatings |
Hard multicoatings |
| Objective diameter |
120 mm |
| Focal length at prime focus |
900 mm |
| Focal ratio at prime focus |
F/7.5 |
| Backfocus distance at prime focus |
227.5 mm |
| Threads | M72 x 1 |
| Dew shield diameter | 162 mm |
| Tube diameter | 126 mm |
| Tube length | 990 mm with dew shield extended, 870 mm with dew shield retracted |
| Tube weight | 6.7 kg |
| SKU | TTK12010 |
Measurements
| Prime focus focal length | 900 mm |
|---|---|
| Prime focus focal ratio |
F/7.5 |
| Prime focus backfocus distance |
227.5 mm |
| TOA-35FL flattener focal length |
882 mm |
|
TOA-35FL flattener focal ratio |
F/7.3 |
|
TOA-35FL flattener backfocus distance |
117.5 mm |
|
TOA-35FL flattener image circle |
40 mm |
| TOA-35RD 0.7x reducer focal length |
672 mm |
|
TOA-35RD 0.7x reducer focal ratio |
F/5.6 |
|
TOA-35RD 0.7x reducer backfocus distance |
62.5 mm |
|
TOA-35RD 0.7x reducer image circle |
40 mm |
| EXT-ED 1.5x extender focal length | 1350 mm |
| EXT-ED 1.5x extender focal ratio | F/11.3 |
| EXT-ED 1.5x extender backfocus distance | 117.5 mm |
| EXT-ED 1.5x extender image circle | 44 mm |
Items included
- TSA-120 OTA
- TKP27110 Ocular adapter (50.8)
- TKP31112 50.8 Extension tube (L)
- TKP00113 50.8 sleeve
- TKP00103 Coupling (S)
- TKP00101 Ocular adapter (31.7mm)
Downloads
 TSA-120 instruction manual
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