FSQ-106EDX4 Quadruplet Refractor Telescope
FSQ-106EDX4 Quadruplet Refractor Telescope
FSQ-106EDX4 Quadruplet Refractor Telescope


FSQ-106EDX4 Quadruplet Refractor Telescope

Regular price
$ 7,330.00
Sale price
$ 7,330.00
Unit price

This item is a Special Order from the Manufacturer

Special Order


The Takahashi FSQ-106EDX4 is a redesign of the popular FSQ-106 and is a superior flat-field super quadruplet refractor.  This redesigned version features a flat field advanced Petzval quadruplet design, with extra-low dispersion (ED) glass for super color correction in the UV, visible and IR wavelengths.  This optical design results in pin point star images and increased field illumination.  Designed from the ground up for digital imaging, this new 4 element / 4 group design is also capable of stunning visual performance.

Some of the features of this outstanding design include:

  • Completely new optics for digital imaging, featuring two premium ED elements for outstanding color correction
  • An advanced Petzval design includes an almost full aperture G3 lens to ensure greater image illumination
  • A flat field without the need for an additional flattener, across a large 88 mm image circle
  • Generous 178 mm back focus allows the user to attach a variety of imaging cameras and accessories, 2 inch diagonals, and many other visual devices including bino viewers.
  • A 4 inch, heavy duty focuser with a an included camera angle adjuster for precise rotation of CCD cameras
  • An anti-torquing draw tube that uses a second rack located on the top of the tube and loaded with ball bearings to prevent any rotation when a heavy instrument package is attached.
  • Airline portable, with a total length of less than 17 inches with the lens shade retracted

Spot Diagrams

FSQ-106ED f/5.0 Spot Diagram


FSQ-106ED with 645 Reducer Spot Diagram


FSQ-106ED with f/3 reducer

Optical Tube Assembly only (mount, tripod, tube holder and finder sold separately).




Part Number



106 mm



Limiting Magnitude


Light Gathering Power


Focal Length

530 mm

Focal Ratio


Image Circle Diameter

88 mm

Optical Type

Fluorite ED Quadruplet

Tube Diameter

125 mm

Tube Length (With Lens hood retracted)

675 mm (580 mm)

Tube Weight

7.0 kg

Recommended Finder


Metal Back Distance

178 mm


Telescope Specifications 

FSQ-106EDX4 System Chart

Personal Upgrade Path

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