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Takahashi - TSA-120 Apochromatic Refractor Telescope - (EM11 T-2M Mount)


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The TAKAHASHI TSA-120 refractor is the second issue in the new TSA line of Takahashi Triplet Super Apochromats.  The 3 Element Objective lens set consists of an air-spaced design with a  multi-coated premium quality ED (extra low dispersion) FPL-53 glass lens between 2 broadband multi-coated, optimum quality Crown lenses.  The color free images produced will delight lunar, planetary and deep sky observers with very high contrast images with pin-point stars, precise edge-to-edge clarity, and free of any chromatic abberation.  The Optical Quality and Construction of the TSA120 is quite simply the very best of the best available today!  

The compact size, less than 28" with the lens shade retracted, makes the TSA-120 the perfect airline-ready apochromat. The TSA-120 is great for eclipse expeditions or transport to remote sites.

Not only is the TSA-120 a great visual instrument, but with an optional Takahashi Field Flattener TOA130FF it can be converted into a flat field, 882mm, f/7.3, or with the optional Takahashi Focal Reducer TOA130R a 672mm, f/5.6 wide field imaging platform perfect for a CCD camera or digital SLR. The addition of the optional Camera Angle Adjuster allows the image to be rotated 360° without loss of focus. The Camera Angle Adjuster is also very handy for visual applications to position the included LE-18mm Ocular and Takahashi 1.25" Diagonal Prism, multiple diagonals or Binoviewer in the best, most comfortable position.

The TSA-120 is a compact, high quality, apochromatic, versatile Takahashi, made for the refractor enthusiast who wants a premium, high quality instrument in a relatively compact package. 

Complete Package Includes:

  • TSA-120 tube assembly with accessories
  • TSA-120 tube holder
  • 7x50 finder
  • 7x50 finder bracket
  • Finder quick release bracket
  • MEF-3 Micro edge focuser
  • EM-11 T-2M mount
  • FC-L tripod
  • 1-1/4 inch diagonal
  • LE-18mm MC ocular 


  • Aperture: 120mm
  • Focal Length: 900mm
  • Focal Ratio: 7.5
  • Tube Length with Dew Shield: 990mm
  • Tube Diameter: 125mm
  • Diameter of Dew Shield: 713mm (28")
  • Weight: 12.6 lbs
  • Resolution: 0.97
  • Limiting Magnitude: 12.1
  • Back Focus: 227.5mm (8.93")
  • With TOA-35 Flattener:
      Focal Length: 882mm
      Focal Ratio: f/7.3
  • Optical Performance: 7 micron RMS-spot to 20mm off axis
  • Image Circle: 40mm
  • Image Field: 2.6" diameter.
  • With TOA-35 Reducer:
      Focal Length: 672mm
      Focal Ratio: f/5.6
  • Optical Performance: 4 microns RMS-spot on axis, 6 microns 10mm off-axis, 13 microns 20mm off-axis, 40mm/3.4" field.
  • Power Consumption 12V : 0.3A (tracking at sidereal rate), 1.3A (high speed slewing), 1.7A (starting) 24V : 0.3A (tracking at sidereal rate), 1.9A (high speed slewing), 1.9A (starting).
  • Tube Mounting and Mounting Capacities: 2 x M8 screws (separated by 35mm) and tube rings, plates and dovetail mounting plates.
  • R.A. axis diameter (material) 52 mm (aluminium)
  • R.A. worm gear shaft diameter (material) 14 mm (iron)
  • R.A. gear diameter (material) 74 mm/144 teeth (zinc)
  • DEC. axis diameter (material) 52 mm (aluminium)
  • DEC. worm gear shaft diameter (material) 14 mm (brass).
  • Stepper Motors Accuracy 100 pps
  • Slow Motion Speeds 0.1x to 1.9x the sidereal rate
  • High Speed Mode 120x the sidereal rate (12V DC)
  • 240x the sidereal rate (24V DC).
  • Worm gear shaft cycle 10 minutes
  • Tracking Accuracy +/- 10"
  • Autoguiding SBIG ST-4/7 compatible.
  • Maximal Loading Capacity 9 kg (without counterweight)
  • Optimal Loading Capacity 6 kg (without counterweight).
  • Elevation Adjustments 20 to 50 degree
  • Polar Finder / Accuracy Built-in / 5' - R.A. Setting Circle Accuracy 10 arcminutes
  • DEC. Setting Circle Accuracy 2 degree





Additional Information

Name Takahashi - TSA-120 Apochromatic Refractor Telescope - (EM11 T-2M Mount)
Manufacturer Takahashi
Model TSS0120
Manufacturer Part No TSS0120
Telescope Aperture 4.1" - 5"
Alignment Procedures EQ North Align, EQ South Align
Aperture 4.7"
Computer Hand Control Yes
Counterweights 1 @ 14.33 lb. included
Diameter 4.92"
Eyepieces 18mm LE
Finderscope 7 x 50 Optical Finder
Focal Length 900mm
Focal Ratio f/7.5
Focuser 2.7" Rack & Pinion
Highest Useful Magnification 300x
Image circle 40mm
Limiting Stellar Magnitude 12.8
Mount Equatorial - Motorized w/GoTo Option
Optical Coatings Fully Multi-Coated
Optical Design Refractor - Apochromatic
Optical Tube Length 28"
Optical Tube Weight 15.4 lb.
Star Diagonal Yes - 1.25" Star Diagonal