Takahashi FSQ-106EDX4 Refractor OTA

$6,040.00

Out of stock

Takahashi FSQ-106EDX4 Systems Chart

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, featureing two premium ED elements for outstanding color correction
  • An advanced Petzval design includes an almost full aperature 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

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

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Specifications with Optional Reducers or Extenders

  • Reducer: Takahashi 645 Reducer 0.7X
  • Product Number: TKA38580
  • Effective Focal Length: 371 mm
  • Effective Focal Ratio: f/3.5
  • Resulting Image Circle: 70 mm

Reducer: Takahashi 645 Reducer QE 0.72X

  • Product Number: TKA38580L
  • Effective Focal Length: 380 mm
  • Effective Focal Ratio: f/3.6
  • Resulting Image Circle: 60 mm

Reducer: Takahashi f/3 Reducer 0.6X

  • Product Number: TKA38581
  • Effective Focal Length: 318 mm
  • Effective Focal Ratio: f/3
  • Resulting Image Circle: 44 mm

Reducer: Takahashi 0.73X Reducer Corrector

  • Product Number: TKA82580
  • Effective Focal Length: 387 mm
  • Effective Focal Ratio: f/3.6
  • Resulting Image Circle: 35 mm

Extender: Takahashi Extender Q 1.6X – 2”

  • Product Number: TKA36595
  • Effective Focal Length: 850 mm
  • Effective Focal Ratio: f/8
  • Resulting Image Circle: 44 mm

It can be challenging to figure out which adapters and other accessories you need in order to use your FSQ-106EDX4 visually or photographically. Below you will find several lists that should help make that task a whole lot easier! Links to suggested or required products will be included when applicable so that you can read more about an item and easily add it to your cart. If you have any questions or concerns, feel free to give us a call, start a chat, or send us an email.

Attaching the FSQ to a Mount

There are just two items required for attaching the FSQ-106EDX4 to an equatorial mount: The proper diameter rings and a dovetail. Several different manufacturers make dovetails and rings that will work fine, but here is what we recommend:

Using the FSQ Visually

Below you will find two accessory chains that you can follow if you want to use this telescope visually; one ending in a 2” diagonal and one ending in a 1.25” diagonal. Items in the chain that are included as standard accessories are marked as such, otherwise, each piece will be linked to the accessory on our website. Items are listed in the order you would attach them to the telescope.

Accessory Chain Ending in a 2” Diagonal

Accessory Chain Ending in a 1.25” Diagonal

Canon EOS or Nikon DSLR Imaging

Below you will find the accessory chain that you can follow if you want to use this telescope with a Canon or Nikon DSLR. Items in the chain that are included as standard accessories are marked as such, otherwise, each piece will be linked to the accessory on our website. Items are listed in the order you would attach them to the telescope.

Imaging with a Dedicated Astronomy Camera

Below you will find the accessory chain that you can follow if you want to use this telescope with a dedicated astronomy imaging camera. Items in the chain that are included as standard accessories are marked as such, otherwise, each piece will be linked to the accessory on our website. Items are listed in the order you would attach them to the telescope.

  • OTA ending in 4” Focuser (Included)
  • #82 645 RD Reducer (Included)
  • #6A Camera Angle Adjuster (Included)
  • #81S Aux Ring S (Included)
  • #8A Coupling (Included)*

*The 8A Coupling ends in Female M54 x 0.75 Takahashi Wide Mount threads, and after its installation, you will have 56mm of back focus left. At this stage, the focuser still has 15mm of inward and outward travel. If you want to use M42mm spacers at this point, you can convert the Wide Mount threads to standard T-threads with the Wide Mount to T-Thread CCD Adapter (TCD0001), which itself takes up 5mm of back focus. Now you can use standard 42mm spacers as needed to take up the rest of the difference in your imaging train.

Telescope Specifications

FSQ-106EDX4 System Chart

FSQ-106EDX4 Extender System Chart

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  • Takahashi FSQ-106EDX4 Quadruplet Astrograph Refractor Telescope Optical Tube
  • 4″ Dual-Speed Rack & Pinion Focuser
  • TKA36581 – 645 Reducer Adapter
  • TKP86200 – CCA (CCA-250)
  • TKA38205 – Aux Ring
  • TKP86003 – 98MM to WM (TW) CA35
  • TKP86005 – CCA-250 Visual Adapter
  • TKP00103 – Coupling S
  • TKP00101 – Eyepiece Adapter
Product specification

Model Number

TQE10630

Telescope Series

Takahashi FSQ

Focal Ratio

f/5

Optical Design

Refractor

Telescope Aperture

106mm (4.17″)

Telescope Mount Type

No Mount – OTA Only

Type of Electronics

OTA Only – No Electronics

Number of Refractor Elements

4 (Quad)

Focal Length (mm)

530

Image Circle

88 mm

Focuser Style

Rack & Pinion

Focuser Size

4″

Focuser Speed

Dual Speed

Telescope OTA Outside Diameter (in.)

4.9

Telescope OTA Weight (lb.)

15.4

Warranty

Takahashi 5 Years Optics/Mechanical, 1 Year Electronics

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