TAKAHASHI TOA-150B REFRACTOR

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

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 Visual System Chart

TOA150B Reducer System Chart

TOA150B Extender System Chart

TOA150B TOA 35 Flattener System Chart

TOA150B 67 Flattener System Chart