The TOA series is a member of Takahashi’s line of triplet refractors. In the TOA design, three lens elements are used, with the front and rear constructed from ED glass. The resulting system achieves a high level of apochromatic performance for both visual observation and imaging. Takahashi engineers have a undertaken a complete redesign of the triplet system, completely eliminating spherical aberration while minimizing axial chromatic aberration in the visible light spectrum.
In typical apochromatic designs, the elimination of chromatic aberration is usually at the expense of increasing spherical aberration at various wavelengths. However, with the TOA series, the focal shift across the entire visible spectrum from 436 nm up to 656 nm is less than +/- 0.01 mm. This is less than 1/100 the aberration of a typical apochromatic design.
The TOA-150B is a 150 mm apochromatic f/7.3 refractor with a focal length of 1100 mm. It features a retractable lens hood, a 4 inch rack and pinion focuser with a 7:1 fine focuser, and a 360 degree camera angle adjuster. A complete line of flatteners, reducers and extenders are available, including the 67-series flattener, which provides a 90 mm imaging circle.
A tube weight is standard to assist in balancing instrumentation or visual accessories.
Please note: mount, tripod, tube holder and finder sold separately.
Included in the box:
Optical Tube Assembly
CAA TKP30200
Coupling (TW) TKP31003
50.8 Sleeve TKP00113
Coupling (S) TKP00103
Ocular adapter 31.7 TKP00101
Ocular adapter 50.8 TKP27110
Extension tube TKP31112
The TOA-150B is the flagship of the Takahashi refractors. It is resolutely turned towards imaging. It supports, without mechanical constraints, the heaviest photo setups including large sensor CCD cameras.
Takahashi TOA-150B refractor
CHARACTERISTIC | TAKAHASHI TOA-150B REFRACTOR |
Optical design | ED Triplet Ortho Apochromat |
Lens cell | Highly air-spaced triplet. 3 lenses/3 groups. 2 x S-FPL53 ED lenses |
Coatings | Hard multicoatings |
Diameter | 150 mm |
AT PRIME FOCUS | |
Focal length | 1100 mm |
Focal ratio | F/7.3 |
Metal back distance | 275 mm |
WITH TOA-35FL FIELD CORRECTOR | |
Focal length | 1080 mm |
Focal ratio | F/7.2 |
Image circle diameter | 40 mm |
Metal back distance | 117.5 mm |
WITH 67FL FIELD CORRECTOR | |
Focal length | 1090 mm |
Focal ratio | F/7.3 |
Image circle diameter | 90 mm |
Metal back distance | 106.2 mm |
WITH TOA-35RD FOCAL REDUCER | |
Focal length | 775 mm |
Focal ratio | F/5.2 |
Image circle diameter | 44 mm |
Metal back distance | 62.5 mm |
WITH EX ED1.5X FOCAL EXTENDER | |
Focal length | 1650 mm |
Focal ratio | F/11 |
Image circle diameter | 44 mm |
Metal back distance | 117.5 mm |
Takahashi TOA-150B refractor
CHARACTERISTIC | TAKAHASHI TOA-150B REFRACTOR |
Length of the optical tube | 1270 mm (1110 mm with retracted dew shield) |
Diameter of the optical tube | 179 mm |
Diameter of the dew shield | 206 mm |
Weight | 15.2 kg |
Focuser | 4'' (112 mm) Rack-and-pinion with microfocuser 1/7 |

Spot-diagram of Takahashi TOA-150B refractor at prime focus

Spot-diagram of Takahashi TOA-150B refractor with TOA-35FL field corrector

Spot-diagram of Takahashi TOA-150B refractor with 67FL field corrector

Spot-diagram of Takahashi TOA-150B refractor with TOA-35RD focal reducer
TOA150B TOA 35 Flattener System Chart
TOA150B 67 Flattener System Chart
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