Focus Scientific

Takahashi TOA-130NFB 130mm (5.1\") Triplet Ortho Apochromat Optical Tube Assembly (OTA)

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-130NFB is a 130 mm apochromatic f/7.7 refractor with a focal length of 1000 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.

The TOA-130 is the first of Takahashi's Ortho Apochromats, featuring a newly designed triplet objective that is absolutely color free.

The 156mm 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-130 not only a superb visual 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 102cm (40.2") for easy transport to remote sites.

Attaching the Extender TOA converts the 130 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.

Features

  • New design 130mm double ED triplet ortho apochromat objective
  • Extremely high order of color correction, absolutely color free images
  • Highly portable with a retractable lens shade, compact tube
  • 4" focuser w/camera rotator bearing allows 360° rotation without losing focus
  • 7 to 1 fine focuser and finder quick release standard
  • Optional f/5.5 Super Reducer for medium format CCD cameras and large chip digital SLRs
  • Oversized tube with knife-edge baffles for extremely high contrast
  • Enhanced back focus to allow the use of any combination of CCD camera, filter wheel, binocular viewer or 2" diagonal
  • Supplied with rigid 72mm long extension tubes to assure deflection free focusing

Specifications

  • Objective: double ED triplet ortho apochromat
  • Aperture: 130mm (5.1")
  • Focal Length: 1000mm (39.4")
  • Focal Ratio: f/7.7
  • Focuser Size: 101.6mm (4")
  • Back Focus: 274.5mm (10.8")
  • Main Tube Diameter: 156mm
  • Knife-edge baffles
  • Length: 1022mm (40.2") (lens shade retracted)
  • Weight: 12.3kg (27.1lbs)
  • Packing: triple carton (maximum protection)
  • Five year manufacturer warranty

Optional TOA-35 FL Flattener

  • Focal Ratio: f/7.5
  • Focal Length: 980mm (38.6")
  • Image Circle: 40mm
  • Back Focus: 117.5mm (4.63")
  • Sold separately

Optional 67 Flattener

  • Focal Ratio: f/7.7
  • Focal Length: 1000mm (39.4")
  • Image Circle: 90mm
  • Back Focus: 106.2mm (4.18")
  • Sold separately

Optional TOA-35 RD Reducer

  • Focal Ratio: f/5.4
  • Focal Length: 698mm (27.5")
  • Image Circle: 44mm
  • Back Focus: 56.2mm (2.21")
  • Sold separately

Optional EX-TOA 1.6X Extender

  • Focal Ratio: f/12.3
  • Focal Length: 1,600mm (63")
  • Back Focus: 117.5mm (4.63")
  • Sold separately