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Takahashi FSQ-106ED

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What is the FSQ-106ED ?

 

The FSQ-106ED is a flat-field f/5 imaging and visual astrograph; the successor to the legendary FSQ-106(N), employs a modified advanced Petzval design of 4 elements in 4 group, two of which are ED (Extra low Dispersion) glass to provide superior color correction.

 

 

 

 

FSQ-ED Characteristics

 

The FSQ-ED utilized the design technology of the ED lens which was cultivated in the TOA series.  Aberrations were well revised with an objective lens constructed of 4 lenses including two ED lenses so the FSQ capabilities were exceeded photographically.

*    Improved Color Correction

As a result of using to high performance ED glass elements, and by positioning the G3 element close to the G2 element, the FSQ-106ED has dramatically improved correction for color and spherical aberration. The new design corrects color for over wide range from the near ultra-violet to the near infra-red, 400nm to 1000nm, which makes the FSQ-106ED the perfect imaging platform.

*    Improved Illumination

The new design increased the size of the G3 element by 50% and placed it close to the G2 element. The result is an increase in field illumination of 20 % for a 35mm frame, 33% for a 70mm Ø image circle and 34% for the 88mm Ø image circle, a great improvement over the standard Petzval design.

*    Improved High Magnification

The new Extender-QE 1.6X was designed to take advantage of the new capabilities of the FSQ-106ED design. The new 50.8mm (2") five element corrector, flattener and extender increases the focal length from 530mm f/5 to 850mm f/8 flawlessly. The correction provided by the Extender-QE allows the highest possible magnification to be used. The 30% increase in color correction provided by the Extender-QE produces diffraction limited images at high and low magnification.

*    Reducer-QE 0.73X

This newly designed f/3.6 dedicated reducer for the FSQ-106ED is a 4 element in 3 group 0.73X accessory. The Reducer-QE maintains the same high level of color correction and field flatness produced by the FSQ-106ED at its native f/5 focal ratio. It was designed to be used with digital SLR's and CCD cameras.

*    Enhanced Back Focus

The FSQ-106ED has been designed with a back focus of 178mm. This enhanced back focus will allow the imager or observer to use any combination of CCD camera, binoviewer or diagonal with their FSQ-106ED. The standard accessories include a prime focus tube, compression ring 50.8mm (2") and 31.7mm (1 1/4") adapters for maximum flexibility.

 

 

 


 

FSQ SERIES

 

 

1999/6: The new product FSQ-106 tube announcement (106-530). Modified Petzval desing, 4 lenses / 2 Fluorite.

2000/6: New product FSQ-106N (Kai) tube announcement (106-530), lens shade becomes sliding system.

2007/1/30: New product FSQ-106ED tube announcement (106-530). Modified Petzval desing, 4 lenses / 2 ED.

2008/4/18: New product FSQ-85ED tube announcement (85-450). Modified Petzval desing, 4 lenses / 2 ED.

2014/12/05: New product FSQ-130ED tube announcement (130-650). Modified Petzval desing, 5 lenses / 3 ED.

 

 

 

 

 

Model

 

Aperture

(mm)

 

Focal Length

f Ratio Lt Grasp Resolution

 

Limit

Mag

 

Tube OD

(mm)

 

 

Tube Length

(mm)

 

 

Weight

(kg)

 

Image  Circle

(mm)

 

Image Field

(degrees)

 

Dew Shield

 OD (mm)

FSQ-106(N)

106 530 / 850 5 / 8 229X 1.09" 11.9 114 650-560 6.3 88 / 44 9.5 / 3 145

FSQ-85ED

85 450 / 327 / 680 5.3 / 3.8 / 8 147X 1.36" 11.4 95 615-525 3.8 60 / 44 / 44  5.6 / 7 / 114

FSQ-106ED

106 530 / 387/ 850 5 / 3.65 / 8 220X 1.09" 11.8 125 675-580 7.0 88 / 44 / 44 9.5 / 6.5 / 3 145

FSQ-130ED

130 650 / 455 / 1000 5 / 3.5 / 8 345X 0.89" 12.3 156 830-700 12.7 110 / 70 / 44   179

 

 

 


 

 

 

 

FSQ-106ED

 

 

 

 

 

 

 

 

 

 

 

 

 

FSQ-106ED with Reducer-QE 073X and Extender-Q 1.6X

 

 

 

 

 

 

 

 

 

 

 

 



 
Takahashi FSQ-130ED

 

 

 

 

Primary Focus

Aperture : 130mm

Focal length : 650mm

Focal ratio : F/5

Optical design : Flatfield Super Quintuplet apochromat

Coating : Broadband multi-layer anti-reflection coatings

Image circle : 110mm diameter (illumination60%)

Optical performance : Off-axis distance (mm) 0 15 22 32 44 55
RMS-spot diameter (micron) 2.0 3.0 4.0 4.5 8.0 17
Relative illumination (%) 100 99 97 92 78 60

 

With New 645 Reducer 0.7x

Focal length : 455mm

Focal ratio : F/3.5

Image circle : 70mm diameter (illuminaton 60%)

Optical performance : Off-axis distance (mm) 0 15 22 32
RMS-spot diameter (micron) 2.5 3.0 4.0 5.0
Relative illumination (%) 100 96 90 60
 

With RD-QE0.73X

Focal length : 474mm

Focal ratio : F/3.6

Image circle : 44mm diameter (illumination 60%)

Optical performance : Off-axis distance (mm) 0 15 22
RMS-spot diameter (micron) 3.0 5.0 14
Relative illumination (%) 100 90 65
 

With EX-ED1.5X

Focal length : 982mm

Focal ratio : F/7.5

Image circle : 44mm diameter (illumination 60%)

Optical performance : Off-axis distance (mm) 0 15 22
RMS-spot diameter (micron) 2.0 15 30
Relative illumination (%) 100 80 65
 

With EXQ-1.6X

Focal length : 1043mm

Focal ratio : F/8

Image circle : 44mm diameter (illumination 60%)

Optical performance : Off-axis distance (mm) 0 15 22
RMS-spot diameter (micron) 4.0 8.0 10
Relative illumination (%) 100 75 58

 

FSQ-130ED

 

 

 

FSQ-130ED 645RD0.7X

 

 

 

 

 

 



 

 
Takahashi FSQ-85ED

 

 

 

 

FSQ-85ED

 

 

 

 

 

 

 

 

 



 

 
Takahashi FSQ-106N

 

 

 

 

 

 

 

 

 

 


 

 


 

 

 


 

 


 

 

 

 

 

 

 

 


 

Acknowledgements:

Akihiko Ito

Masao Tanikawa

Temmon Guide

Takahashi Europe

Takahashi Seisakusho Ltd

 

This is an unofficial site about Takahashi FSQ series telescopes and for further information please, refer to Takahashi web site.

 

 

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