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TSA-120

The TSA-120 is equipped with an air-spaced ED triplet apochromatic lens with 120 mm diameter (900 mm focal length and F/D 7.5), mounted in a 3-element barrel.

Available configurations

TSA-120 refractor

Reference : [TTK12000]
[TKA00552] - Finder 7x50
[TKA00563] - Finder bracket for 7x50 finder
[TKA36420] - Cradle 125S
[TTK12010] - TSA-120 refractor OTA

TSA-120 refractor OTA

Reference : [TTK12010]

The TSA-120 is equipped with an air-spaced ED triplet apochromatic lens with 120 mm diameter (900 mm focal length and F/D 7.5), mounted in a 3-element barrel. The latter ensures good stability of the optomechanical chain in the face of usual transport constraints and significant variations in operating temperature. It has a retractable dew shield and the length of the tube does not exceed 990 mm for a moderate weight of 6.7 kg.

The lens has been designed to achieve a very high level of performance in observation and photography. The chromatic aberration in short wavelengths (blue and violet) is reduced by one third compared to the old FS-102/FS-128 with Fluorite lens. The Strehl ratio at optimal wavelengths of human vision is almost perfect, at 99.2%, equivalent to that of the TOA series.

The TSA-120 is therefore a lightweight, compact and economical refractor, whose performance is similar to that of the TOA, Takahashi's flagship models and recognized as among the best in the world.

The addition of the optional field corrector allows native focus imaging. The TOA-35 reducer (F/5.25) makes it more comfortable in deep sky photography. All assemblies meet the rigidity and flexibility requirements of new imaging devices, such as digital cameras and the latest generation of CCD cameras.

Specifications

Optical Specifications
Lens ED Triplet Super Apochromat
Lens cell Air-spaced triplet. 3 lenses/3 groups. 1 S-FPL53 ED lens in the center.
Coatings Hard multicoatings
Diameter 120 mm
At prime focus
Focal length 900 mm
Focal ratio F/7.5
Metal Back Distance 227.5 mm
With flattener TOA-35 FL
Focal length 882 mm
Focal ratio F/7.3
Image circle diameter 40 mm
Angle of field 2.6 degrees
Metal Back Distance 117.5 mm
With reducer TOA-35 RD
Focal length 672 mm
Focal ratio F/D 5,6
Image circle diameter 40 mm
Angle of field 3.4 degrees
Metal Back Distance 62.5 mm
With extender EXT-ED1.5X
Focal length 1350 mm
Focal ratio F/D 11,3
Image circle diameter 44 mm
Metal Back Distance 117.5 mm
Mechanical Specifications
Length of the optical tube 990 mm (with fixed dew shield)
Diameter of the optical tube 125 mm
Diameter of the dew shield 160 mm
Weight 6.7 kg
Focuser Rack-and-pinion

Spot diagrams

TSA-120 at prime focus

Spot-diagram of the Takahashi TSA-120 refractor at prime focus

TSA-120 with field flattener TOA-35 FL

Spot-diagram of the Takahashi TSA-120 refractor with field corrector TOA-35 FL

TSA-120 with focal reducer TOA-35 RD

Spot-diagram of the Takahashi TSA-120 with focal reducer TOA-35 RD

System-charts

TSA-120 main system-chart Download  
TSA-120 system-chart with focal reducer TOA-35 RD Download  
TSA-120 system-chart with Extender ED1.4X Download  

gallery

The Leo Triplet by Maxime Delin

NGC6946 with 2017eaw supernova by Maxime Delin

Crescent Nebula by Maxime Delin

Around NGC891 by Maxime Delin

TSA-120 refractor
TSA-120 refractor
TSA-120 refractor OTA
TSA-120 refractor OTA