Takahashi FSQ-85EDX F/5.3 Quadruplet Apo Refractor Telescope
The FSQ-85EDX is a more mobile version of the FSQ-106EDX4 for lovers of wide-field deep sky imaging.
Like its predecessor, it is based on an apochromatic Petzval quadruplet formula including 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: Takahashi FSQ-85EDX F/5.3 Quadruplet Apo Refractor Telescope
Characteristic
- 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
- Length of the optical tube: 623 mm (535 mm with retracted dew shield)
- Diameter of the optical tube: 95 mm
- Diameter of the dew shield: 114 mm
- Weight: 3.6 kg
- Focuser: Rack-and-pinion with 1/7 microfocuser
At prime focus
- Focal length: 450 mm
- Focal ratio: F/5.3
- Metal Back Distance: 197.5 mm
With 1.01X field corrector
- Focal length: 455 mm
- Focal ratio: F/5.4
- Image circle diameter: 44 mm
- Metal Back Distance: 56.2 mm
With RD QE0.73X focal reducer
- Focal length: 327 mm
- Focal ratio: F/3.8
- Image circle diameter: 44 mm
- Metal Back Distance: 72.2 mm
With EX ED1.5X focal extender
- Focal length: 680 mm
- Focal ratio: F/8
- Image circle diameter: 44 mm
- Metal Back Distance: 117.5 mm
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