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Cyclops Optics

William Optics Zenithstar 73 f/5.9 APO (Free Soft Carrying Bag)

Discontinued. Succeeded by ZenithStar 73-II

William Optics Zenithstar 73 f/5.9 APO (Free Soft Carrying Bag)

Discontinued. Succeeded by ZenithStar 73-II
Shipping Weight:
5.00 KGS
Accepting order now!

Product Description

Now comes with FREE WO patented Diffraction Spikes Bahtinov Mask Cap


Zenithstar 73 is a greatly versatile and portable refractor telescope for beginners and veterans alike. Designed for both astrophotography and wildlife photography, high power visual observing through the Zenithstar 73 is also hugely satisfying. The image is crisp, sharp and colour aberration free thanks to the use of top quality glass — FPL53, closely matching the legendary fluorite material. The 43mm image circle when Flat73 is used covers full frame size sensor nicely. 

Zenithstar 73 Package Includes

  • Z73 Doublet Air-Spaced APO with synthetic fluorite FPL-53 extra low dispersion glass
  • 2.5" Rack & Pinion focuser with 10:1 micro adjustment
  • Mounting Rings
  • CNC Handle Bar with Vixen style quick release or guidescope
  • Vixen style dovetail bar
  • 2" to 1.25" adapter with brass compression ring
  • Retractable lens shade
  • FREE WO patented Diffraction Spikes Bahtinov Mask Cap
  • FREE high quality soft carrying bag (retails for US$39)

+ With FREE high quality soft carrying bag, exclusively from Cyclops Optics (US$39 when sold separately)

Z73 Design Highlights

  • 73mm f/5.9 doublet air-spaced objectives APO
  • Use of Japanese made Ohara synthetic fluorite FPL-53 glass material
  • Very sharp image with excellent colour correction
  • Precision optics with fully multi-coated lenses using super-high transmission (STM) coating on all surfaces
  • Designed for astrophotography, wildlife photography & visual observation 


Cyclops Optics' Exclusive Fine Tuning Service

We offer fine tuning service for the telescopes to provide a smoother screws control and grant the telescope a premium quality touch. The fine tune service costs HK$400 (US$50). It's now waived for time-limited period.


Optical system Air-spaced doublets with 1 FPL-53 fluorite element
Aperture 73 mm
Focal length 430 mm
Focal ratio f/5.9
Image circle

Full frame corrected field with Flat73A, Flat73R

Resolution 1.83 arcseconds
Limiting magnitude 12.9
Light gathering power 109x
OTA length

330 mm (fully contracted)

420 mm (fully extended)

Weight 2.83 kg



7 days no question asked return if due to material or workmanship defects

2 years manufacturer's warranty from William Optics

Cyclops Optics Ltd. is an authorised dealer of William Optics' products.

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