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William Optics Star 71

William Optics Star 71
William Optics Star 71William Optics Star 71William Optics Star 71
Price:  £1,199.00
List Price:  £1,299.00
(Inc. 20% VAT)

Product Code:  A-WO71-II-GD
Brand:  William Optics
Telescope Type:  APO Quadruplet Refractor
Aperture (mm):  71 mm

William Optics

This scope is ultimately designed for astronomers who want the best results in photographic/CCD imaging. The WO-Star71 II imaging telescope provides pinpoint stars at the very edge of a 45mm imaging circle

Version 2 has one less element, however now there are 2 elements that utilize FPL-53 ED glass to achieve the same optical performance, while making it easier to collimate during assembly.

Key Features

  • 71mm f/4.9 Imaging Refractor Telescope.
  • FPL-53 glass for color free apochromatic performance.
  • Covers 45mm full frame imaging circle.
  • 2.5" dual speed R&P focuser.
  • Includes mounting rings and Vixen style dovetail.
  • Weight = 4.5 lbs / 2.05 kg (OTA only); 5.3 lbs / 2.4 kg (OTA with rings and dovetail).
  • Focuser drawtube travel = 1.38" / 35mm.

Additional Information
Focuser drawtube terminates in a male M48 thread. Telescope comes with a wide M48-Canon EOS adapter ring. Similar rings are available from other manufacturers for other brands of cameras. Not a conventional 2" focuser tube with locking thumbscrews.

Optional 1.25" 90-deg dielectric mirror diagonal sold separately for those wishing to use this as a visual. This diagonal comes with a custom adapter that connects directly to the M65(First Version)/ M63(Second Version) female thread on the telescope's focuser tube; you cannot use standard 1.25" diagonals. Telescope cannot reach focus with larger 2" diagonals.
Optional soft carry case available separately.

Aperture 71mm
Focal Ratio F/4.9
Focal Length 350.2 mm
Objective Type
New improved (Star 71-II)
4 elements in 3 groups (2-1-1- configuration; new, unique, patented design)
Objective Type(Star 71)
5 elements in 3 groups (3-1-1- configuration; new, unique, patented design)
Lens Shade Retractable
R&P Focuser 2.5" dual speed R&P focuser
Focuser drawtube travel = 1.38" / 35mm
Type of Mount Includes mounting rings and Vixen style dovetail
Tube Weight Weight = 4.5 lbs / 2.05 kg (OTA only); 5.3 lbs / 2.4 kg (OTA with rings and dovetail)

Specification for Apochromatic Lenses

All WO refractors objective are double tested and inspected before shipping to our customer, these telescopes are free of coma and astigmatism.
Since all individual lens surfaces are machine coated sometime it could have visual imperfections which do not affect the objective optical performance.

Dimensions of scratches and points shall not exceed the following values:

Scratches Width, not more, mm 0.025mm
Total length, not more 1/4 of total lens diameter.
Quantity no more 3
Dots or spot points No more, mm 0.4mm
Quantity, no more 3
Accumulation of defects Limited area, mm 0.8mm^2
Total area of scratches and points, no more, square mm 5.8mm^2


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Telephone: 01353 776199 or 07990 646466

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