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William Optics Zenithstar 61II APO

SKU WO-A-Z61IITG
Original price CA$962.00 - Original price CA$962.00
Original price
CA$962.00
CA$962.00 - CA$962.00
Current price CA$962.00
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  • 61mm Aperture Apochromatic Doublet Refractor
  • Ohara FPL-53 ED Glass Element
  • Fast f/5.9 Focal Ratio for Wide-Field Imaging
  • Includes Flat61A Field Flattener
  • 2-inch Dual-Speed Rack & Pinion Focuser
  • Integrated Bahtinov Mask in Lens Cap
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty
  • William Optics Zenithstar 61II APO Refractor

    The William Optics Zenithstar 61II APO packages a color-free FPL-53 glass doublet and a precise 2-inch dual-speed focuser into a compact, portable optical tube. Designed as a complete wide-field imaging solution, this f/5.9 refractor includes the essential Flat61A field flattener, delivering an instrument ready for demanding astrophotography right out of its included soft case.

    FPL-53 APO Doublet for Apochromatic Imaging

    At the core of the Zenithstar 61II is an air-spaced doublet objective featuring a genuine Ohara FPL-53 ED glass element. This apochromatic design virtually eliminates chromatic aberration, ensuring stars are rendered as sharp, high-contrast points of light without distracting purple fringing. The result is cleaner raw data with truer color fidelity, whether you're imaging emission nebulae or capturing the subtle hues in a star cluster.

    Field-Ready Portability and CNC Mechanicals

    Engineered for the traveling imager, the Z61II is built from CNC-machined aluminum for a rigid yet lightweight frame that holds collimation. The scope includes a Vixen-style dovetail for compatibility with a wide range of popular mounts, and a unique saddle handle bar that simplifies transport while also serving as a mounting point for guide scopes or other accessories. A custom-fit soft carrying case protects the instrument during travel to your favorite dark-sky site.

    Imaging-Ready with a 2-Inch Focuser and Flat61A Flattener

    William Optics delivers the Z61II as a complete imaging system, not just an optical tube. The 2-inch dual-speed focuser provides the fine adjustment needed for critical focus, a process made simple by the Bahtinov mask cleverly integrated into the lens cap. Crucially, the package includes the matched Flat61A field flattener, which corrects for field curvature to ensure your images have sharp, pinpoint stars from the center to the corners of the frame—an essential component often sold separately.

  • Is the William Optics Zenithstar 61II ready for astrophotography out of the box?

    Yes. The Zenithstar 61II is packaged as a complete imaging solution. It includes the essential Flat61A field flattener to ensure sharp stars across your sensor, a precise 2-inch dual-speed focuser for accurate adjustments, and an integrated Bahtinov mask in the lens cap for achieving critical focus easily.

    How does the FPL-53 glass in the Zenithstar 61II benefit imaging?

    The Ohara FPL-53 ED glass element provides apochromatic (APO) color correction. This minimizes chromatic aberration, or false color, which can appear as purple halos around bright stars. For imagers, this means sharper stars, higher contrast, and more accurate color data directly from the camera.

    What makes the Zenithstar 61II a good portable or travel telescope?

    The Z61II is designed for portability. Its compact size, lightweight CNC-machined aluminum body, and included padded soft carrying case make it easy to transport. It's an ideal "grab-and-go" scope for taking to dark sky sites or on trips.

    How would the Zenithstar 61II frame a large target like the North American Nebula (NGC 7000)?

    The Zenithstar 61II's wide field of view is perfectly suited for large deep-sky objects. When paired with a camera using an APS-C or smaller sensor, it can easily capture the entirety of massive targets like the North American Nebula (NGC 7000) or the Andromeda Galaxy (M31) in a single frame.

    Can I use the Zenithstar 61II for visual observing on a small tracking mount?

    Absolutely. While optimized for imaging, the Z61II is also an excellent visual instrument. Its light weight and Vixen dovetail make it a perfect match for portable tracking mounts like the Sky-Watcher Star Adventurer. With a 2-inch diagonal and a low-power, wide-field eyepiece, it provides stunning, expansive views of the Milky Way.

    What is the purpose of the saddle handle bar on the Zenithstar 61II?

    The handle bar serves two functions. It provides a secure and balanced grip for carrying the telescope and placing it on a mount. It also features a Vixen-style saddle, allowing you to mount accessories like a small guide scope or a red dot finder directly on top of the optical tube.

  • Available Options Grey, Gold
    • Zenithstar 61 II APO OTA

      × 1

    • Flat61A Field Flattener

      × 1

    • Mounting Rings with Saddle Handle Bar

      × 1

    • Vixen-Style Dovetail Bar

      × 1

    • Lens Cap with Integrated Bahtinov Mask

      × 1

    • Soft Carrying Case

      × 1

  • William Optics 2-Year Warranty