Takahashi TOA-150B 150mm (5.9") Triplet Ortho Apochromat Optical Tube Assembly (OTA)

Takahashi TOA-150B 150mm (5.9") Triplet Ortho Apochromat Optical Tube Assembly (OTA)

Due to high demand and global product shortages due to the pandemic, please call for availability.

The TOA-150 is the second Ortho Apochromat to be developed by Takahashi. It features a newly designed triplet objective. This new design, like its smaller companion the TOA-130, is absolutely color free.

The 179mm diameter, oversized tube, in conjunction with knife-edged baffles inside the tube, contribute to outstanding contrast.

The high contrast and total lack of false color makes the TOA-150 not only an outstanding optical instrument, but an outstanding imaging platform with a CCD, digital SLR or film camera. Framing the image or placing the ocular in a convenient position is made simple because of the built-in camera angle adjuster that allows the 360° rotation of the camera or ocular without loss of focus.

The smooth heavy duty retractable lens shade allows the length of the TOA-150 to be reduced to 96.5cm (38"0 for easy transport to remote sites.

Attaching the Extender TOA converts the 150 into an f/11.68 planetary instrument capable of very high magnification images. It maintains the color correction and flattens the field.

Note: Takahashi optical tubes are sold without tube holder (rings), finderscope, star diagonal, eyepiece, reducer, extender, mount and tripod. These extra items are sold separately.

Shipping Notice: These high-precision scopes must be shipped by air for the full warranty to apply. Air shipping charges are not included in our price, and will be added to your bill. We would be happy to quote shipping charges.


  • New design 150mm triplet ortho apochromat
  • Extremely high order of color correction, absolutely color free images
  • Highly portable with a retractable lens shade, compact tube
  • 10 to 1 fine focuser and finder quick release standard
  • 4" focuser w/camera rotator bearing allows 360° rotation without losing focus
  • Optional f/5.5 Super Reducer for medium format CCD cameras and large chip digital SLRs
  • Oversized tube for superior baffling
  • Knife edge baffles for extremely high contrast images
  • Enhanced back focus to allow the use of any combination of CCD camera, filter wheel, binocular viewer or 2" diagonal


  • Aperture: 150mm (5.9")
  • Focal Length: 1100mm (43.3")
  • Focal Ratio: f/7.33
  • Objective: triplet ortho apochromat
  • Focuser Size: 101.6mm (4")
  • Back Focus: 76mm (3")
  • Main Tube Diameter: 179mm
  • Length: 965mm (38") (lens shade collapsed)
  • Weight: 20kg (44lbs)
  • Packing: triple carton (maximum protection)
  • Five year manufacturer warranty

Optional 35 Flattener

  • Focal Ratio: f/7.2
  • Focal Length: 1080mm (42.5")
  • Image Circle: 40mm
  • Sold separately

Optional 67 Flattener

  • Focal Ratio: f/7.3
  • Focal Length: 1090mm (42.9")
  • Image Circle: 90mm
  • Sold separately

Optional Reducer

  • Focal Ratio: f/5.7
  • Focal Length: 860mm (33.9")
  • Image Circle: 50mm
  • Sold separately

Optional Super Reducer

  • Focal Ratio: f/5.5
  • Focal Length: 825mm (32.5")
  • Image Circle: 70mm
  • Sold separately