William Optics Zenithstar 73

Worth knowing before you buy

How does the AT80EDL compare to other 80mm refractors like the Televue 76 or Stellarvue 80?

Owners report the AT80EDL offers exceptional optical quality at its $700 price point, with notably better color correction than older Televue models and comparable sharpness to much more expensive scopes like the Stellarvue 90mm. One owner rated it at the top of their list of 80-90mm scopes owned over many years, just ahead of a former Stellarvue 90mm triplet.

Is the focuser really as good as people say?

Yes—multiple owners praise it as exceptional for a scope at this price, with a smooth rack-and-pinion design, zero backlash, and no need for upgrades for visual use. However, some users adding a Baader Click-Lock clamp found they lost inward focus travel with 2-inch eyepieces due to the clamp's thickness.

What's the actual overall length when fully assembled with a diagonal and eyepiece?

With a 2-inch diagonal and focuser fully racked in, owners report lengths between 20.5 and 20.

What mount should I use with the AT80EDL?

Owners have successfully used it on Alt-Az mounts like the Explore Scientific Twilight 1 and equatorial mounts like the CG-4 with drives for tracking. The scope works well grab-and-go on lighter mounts, but if adding accessories like a prism diagonal or binoviewer, a heavier tripod becomes more necessary for vibration control.

How much chromatic aberration does it have?

Owners report minimal to imperceptible chromatic aberration at focus during normal observing, only visible when racking through focus. One owner explicitly stated it has notably better color correction than their older Televue 76, and chromatic aberration was not intrusive even at high magnification (3mm eyepiece, ~186x).

Is it worth the $700 price when used models of expensive brands are available?

Owners view it as exceptional value for the optical and mechanical performance, representing an amazing value-to-performance ratio that makes it competitive with scopes costing significantly more. At $700 new with a smooth focuser and sharp optics, multiple owners placed it at the top of their list of owned small refractors despite having owned pricier alternatives.