TAKAHASHI
The FSQ-85EDX is a more mobile version of the FSQ-406EDX4 for lovers of wide-field deep sky imaging.
Available Upon Request
In this case, we do not keep the products in stock but are only available upon pre-order. As soon as we receive your order, we will notify you by e-mail or phone, about the exact delivery time.
FSQ-85EDX TUBE ASSEMBLY COMPLETE D-85mm F-450mm F/5.3
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 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!
Net Weight (g) | 3600 |
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Optical design | Apochromatic Refractor |
Aperture (mm) | 85 |
Focal length - F (mm) | 450 |
Focal ratio (f/) | 5.3 |
Mount | Not included |
Finderscope | 6x30 |
Maximum useful magnification (x) | 170 |
In the box:
Characteristic | Takahashi FSQ-85EDX refractor |
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 |
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 |
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 |
Spot-diagram of Takahashi FSQ-85EDX refractor with 1.01X field corrector
Spot-diagram of Takahashi FSQ-85EDX refractor with RD QE0.73X focal reducer
Spot-diagram of Takahashi FSQ-85EDX refractor with EX ED1.5X focal extender