Takahashi TSA-120 O.T.A.


  • Second TSA triplet apochromat
  • Very high order of color correction
  • Compact design only 28” long collapsed
  • Long back focus 227mm [8.93”] to accommodate bino viewers and any 2” diagonal
  • Supplied with 2” and 1/1/4” accessories and extension tubes  
  • Knife edge baffles are standard for highest contrast

The TSA-120 is the second triplet apochromat in the TSA Series. Its superb color correction will provide high contrast images with pin point stars across the field.


The compact size of 28” allows the TSA-120 to be easily transported to remote sites.


The TSA-120 is a great scope for imaging. The TOA 35 flattener converts the 120 into an f/7.3 882mm flat field 2.6º instrument and the reducer changes it to an f/5.6 672mm


Tube assembly ships 2nd day air. Please call to order 713-529-3551


OPTICAL SPECIFICATIONS for the TSA-120 (Tube assembly only)

Focal Length900mm
Focal RatioF/7.5
Optical DesignTriplet ED apo
CoatingBroad band multi-layer anti-reflection

Mechanical Specs

Diameter of main tube: 125mmø
Diameter of dew shield [sliding]: 713mm <-->[28”]
Weight of OTA5.7 kgs/12.6 lbs
Back focus: 227.5mm [8.93”]

TOA-35 Flattener

Focal Length882mm
Focal Ratiof/7.3
Optical performance 7 micron RMS-spot to 20mm off-axist
Image Circle: 40mmø
Image Field: 2.6ºø diameter

TOA-35 Reducer

Focal Length672mm
Focal Ratiof/5.6
Optical performance 4 microns RMS-spot on axis
6 microns 10mm off-axis
13 microns 20mm off-axis
40mmø/3.4º field

Add to Cart:

  • Model: TSA0120
  • Shipping Weight: 48lbs
  • Manufactured by: Takahashi

This product was added to our catalog on Monday 05 October, 2009.