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FSQ-85EDX

The FSQ-85EDX is a more mobile version of the FSQ-406EDX4 for lovers of wide-field deep sky imaging.

Available configurations

FSQ-85EDX refractor

Reference : [TQE08540]
[TKA00551] - Finder 6x30
[TKA00562] - Finder bracket for 6x30 finder
[TKA21420S] - Cradle 95S with balancing plate
[TQE08541] - FSQ-85EDX refractor OTA

FSQ-85EDX refractor OTA

Reference : [TQE08541]

The FSQ-85EDX is a more mobile version of the FSQ-406EDX4 for lovers of wide-field deep sky imaging.

Like its predecessor, it is based on an apochromatic Petzval quadruplet formula wincluding ED glass. With a focal length of 450 mm and a flat field covering 5.6 degrees over the sky, this refractor is ideal for photography. It is delivered with a 1.01X corrector to make the most of recent sensors with smaller and smaller pixels. The image circle is 44 mm.

The rack-and-pinion focuser is deliberately oversized to improve accuracy and efficiency. It is controlled by a double system of 1/7 ratio wheels and equipped with a CAA (Camera Angle Adjuster) for photographic framing. The retractable dew shield saves space.

A focal reducer is available as an option to transform the telescope into a true high-end 328 mm astronomical telephoto lens, open at 3.9, with a 7 degree field of view on the sky and a 40 mm image circle!

Specifications

Optical specifications
Objective Petzval Quadruplet with ED glass
Lens cell Highly air-spaced quadruplet. 4 lenses/4 groups. 2 x S-FPL53 ED lenses
Coatings Hard multicoatings
Diameter 85 mm
At prime focus
Focal length 450 mm
Focal ratio F/5.3
Metal Back Distance 197.5 mm
With Field Flattener 1.01X
Focal length 455 mm
Focal ratio F/5.4
Image circle diameter 44 mm
Metal back distance 56.2 mm
With Focal Reducer RD-QE0.73X
Focal length 327 mm
Focal ratio F/3.8
Image circle diameter 44 mm
Metal back distance 72.2 mm
With Extender EX-ED1.5X
Focal length 680 mm
Focal ratio F/8
Image circle diameter 44 mm
Metal back distance 117.5 mm
Mechanical specifications
Length of the optical tube 623 mm (535 mm with retracted dew-shield)
Diameter of the optical tube 95 mm
Weight 3.6 kg
Mise au point Rack-and-pinion with 1/7 microfocuser

Spot diagrams

FSQ-85EDX with 1.01X field flattener

Spot-diagram of the Takahashi FSQ-85EDX refractor with field corrector 1.01X

FSQ-85EDX with RD-QE0.73X focal reducer

Spot-diagram of the Takahashi FSQ-85EDX refractor with focal reducer RD-QE0.73X

FSQ-85EDX with EX-ED1.5X extender

Spot-diagram of the Takahashi FSQ-85EDX refractor with extender EX-ED1.5X

System-charts

FSQ-85EDX main system-chart Download  
FSQ-85EDX with RD-QE0.73X focal reducer Download  
FSQ-85EDX with EX-ED1.5X extender Download  

Instruction manual

FSQ-85EDX instruction manual Download  
FSQ-85EDX refractor
FSQ-85EDX refractor
FSQ-85EDX refractor OTA
FSQ-85EDX refractor OTA