William Optics ZenithStar 71 ED Doublet Refractor

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William Optics ZenithStar 71 ED Doublet Refractor
Item # WO-A-Z71A
  • The William Optics ZenithStar 71mm f/5.9 Refractor is small but mighty! Weighing only 6 lb. and just a tad over a foot long, the ZS71 can go anywhere, even under your seat on a plane.
  • The optics of the Zenith Star 71 are made with Ohara glass from Japan, and they are fully-multi-coated for sharpness, clarity, and contrast.
  • The lens cell, powder-coated white optical tube assembly, and dew shield are all CNC-machined.
  • A 2" rack and pinion 10:1 dual-speed focuser is super sturdy and will not slip when locked down, even with heavier cameras attached.
  • An optional reducer is available separately.
  • Accessories shown in the photo at left are sold separately.


William Optics ZenithStar 71 ED Doublet Telescope

The ZenithStar 71 ED from William Optics is a super portable telescope with quality optics. The 71mm ED air-spaced doublet is made with Ohara glass from Japan, and is fully multi-coated with STM super high transmission coatings for high contrast, sharp views. The optics are mounted in a CNC machined precision lens cell to keep them perfectly aligned.

The CNC-machined aluminum optical tube assembly of the ZS71 comes fully baffled to prevent light bounce and a retractable dew shield to further increase contrast. The William Optics 2" rotatable rack and pinion focuser included with this scope allows for 1:10 course and fine focusing. Its mechanical strength makes for extremely smooth movements and no backlash. The focuser can be locked down and will not flex or slip, even with a heavy camera on the back, and the tension is adjustable so that you can set it to accommodate accessories of different weights. The draw tube with graduated scale has a travel length of 80mm.

The William Optics ZenithStar 71 is the perfect telescope for the EAZY-T Alt-Azimuth Mount. It even slides directly onto the mount without the need for a dovetail.

William Optics ZenithStar 71 ED Doublet Refractor Specifications


  • Aperture: 71mm
  • Focal Ratio: F/5.9
  • Focal Length: 418 mm
  • Objective Type: ED Doublet, Air Spaced, Fully Multi Coated
  • Resolving Power: 1.58"
  • Limiting Magnitude: 11
  • Lens Shade: Retractable
  • Focuser: 2" Rack & Pinion 360º Rotatable 1:10 Dual Speed Focuser
  • Tube Travel Length: 80 mm (3.2")
  • Focuser Adapter: 1.25" Adapter with Brass Compression Rings
  • Mount Type: Integrated L Bracket (fits SmartEQ mount)
  • Field Stops: Baffles
  • Tube Diameter: 93 mm (3.66")
  • Tube Length: 310 mm Fully Retracted, 355 mm Fully Extended
  • Tube Weight: 6 lb. (2.7 kg)
Additional Information

Additional Information

Manufacturer William Optics
Telescope Series William Optics ZenithStar
Optical Design Refractor - Achromatic with ED Glass
Mount Type None - Optical Tube Only
Warranty 2 Year Warranty
Telescope Aperture 71mm (2.79")
Telescope Focal Length 418mm
Telescope Focal Ratio f/.9
Optical Tube Outer Diameter 93 mm (3.66")
Length of Optical Tube 310 mm Fully Retracted, 355 mm Fully Extended
Tube Color or Finish Gloss White
Dew Shield Included? Yes
Limiting Stellar Magnitude 11
Finder Included None
Total Telescope Weight 6 lb.

Customer Reviews 1 item(s)

Exceeded my Expectations
First light with the Z71ED. Was able to easily split the Double-Double in Lyra with a fine black hair between the components. Great optics. Checked out Vega. Much less color than I anticipated. Color about 75% of what you can expect from a high end APO. Quality of fit and finish is excellent. Very impressed with high power views of Moon and Jupiter. Great value for the money. Hats off to William Optics.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Nofim / (Posted on 11/15/2014)
Included Items

Included Items

  • William Optics 71mm ZenithStar ED
  • 2" Rack & Pinion Dual-Speed, 10:1 Focuser, fully rotatable
  • 1.25" Adapter
  • Red L-Bracket
  • Red Metal Lens Cap
Questions & Answers

Product Questions

Does the L-bracket fit in a Vixen style dovetail mount, or would it need to be attached to a separate dovetail bar?
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