William Optics Zenithstar 61

Worth knowing before you buy

How good is the optical quality for the price?

Owners consistently praise the AT80EDL as exceptional value, with one reviewer calling it nearly equal in optical performance to a former Stellarvue 90mm triplet while costing $700. Multiple users report minimal chromatic aberration, excellent sharpness, and crisp views that exceeded expectations compared to other budget refractors like the TV76.

What mount should I use with this scope?

The AT80EDL works well on lightweight alt-az mounts like the Explore Scientific Twilight 1, though vibration can be an issue with lighter setups. Several owners recommend the Celestron CG-4 with drives for more stable tracking, while others successfully use it on sturdy tripods like the Berlebach UNI with modest weight capacity overages.

How is the focuser?

The stock rack-and-pinion focuser is described as fantastic and smooth with zero backlash, requiring no upgrade for visual observing. However, owners note that the Baader Click-Lock replacement can cause focus travel issues with 2-inch eyepieces due to the clamp's thickness, so the stock focuser is often kept as-is.

What is the overall length when fully assembled?

With a 2-inch diagonal and eyepiece installed and focuser fully racked in, the OAL ranges from about 20.5 to 20.

How does it compare to the AT80ED?

The AT80EDL has noticeably better color correction than the older AT80ED, with users noting significantly reduced chromatic aberration. The EDL uses improved glass and a better focuser, making it worth the price difference for those concerned about CA performance.

Is this a true grab-and-go scope?

It can be for light observing sessions, though it depends on your setup and comfort level. A 35-pound rig with counterweight bar and additional accessories is cumbersome through doorways and not ideal for frequent transport, but simpler configurations with just the scope, diagonal, and eyepieces are genuinely portable.