William Optics ZenithStar 73 - f/5.9 Doublet Apo Refractor

  • William Optics Z73 f/5.9 Refractor uses FPL-53 glass for sharp views.
  • Built-in Bahtinov Mask ensures you have perfect focus.
  • V-Style dovetail bar included.
  • V-Style dovetail plate/handle included.
  • 2.5" Rack & Pinion focuser.
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  • Regular price $648.00

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William Optics ZenithStar 73 - f/5.9 Doublet Apo Refractor

The William Optics ZenithStar 73 mm Apochromatic Doublet (version II) features Ohara FPL-53 glass improved upon from previous models. This package includes a Vixen-style dovetail bar, 2.5-inch Rack & Pinion focuser, and a built-in Bahtinov mask cover to help focus your telescope.

Color matching Guidescope Rings can be purchased in this link - OPT SKU: WO-M-GR50IISL.


Aperture73 mm (2.75")
Focal Length430 mm
Focal Ratiof/5.9
Free ShippingYes
Glas Type FPL 53
ManufacturerWilliam Optics
Optical TypeDoublet
Tube Length310mm
Tube Weight2.5kg (5.5lb)
Weight5.5 lbs.


  • Z73 APO (version II)
  • Vixen-style Dovetail
  • Bahtinov Mask Included


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5.0 Based on 1 Reviews
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Jacqueline L.
United States United States
Can’t go wrong g with OPT or WO

Zenithstar 73 showed up in 2 days and what a piece of equipment it is! Needed one other small piece and it was delivered the same way, so it seems order amount has no bearing on how you’re taken care of. OPT online support was great when needed as well. Definitely on my top list of suppliers moving forward in this astrophotography pursuit.