William Optics ZenithStar 81 Doublet APO Telescope with Field Flattener - Choose Red or Gold

Out of stock
Regular price $1,391.00 CAD

Product details

  • SKU A-Z81RD-AP

William Optics ZenithStar 81 Doublet
APO Telescope And Field Flattener

  • 81 mm Aperture f/6.9 Imaging Refractor Telescope
  • FPL-53 glass for color free Apochromatic performance
  • Covers full frame imaging circle (44 mm)
  • 2.5" R & P Focuser
  • Colors: Red, Gold
  • Includes Mounting rings and Vixen style dovetail
  • Dovetail is dual type - flip over to get Arca Swiss plate
  • Weight: 3.53 kg
  • Includes Interchangable Camera Mount
  • Includes Dust Cover with built-in Bahtinov Mask & Soft Case
  • Includes P-Flat6AIII Flattener

The William Optics ZenithStar 81 APO Telescope is a high quality Apochromatic Imaging and visual use telescope with an aperture of 81 mm and a focal length of 559 mm or an f-ratio of f/6.9. This ZenithStar 81 APO Telescope can also be used with an interchangable camera mounting system, with various T-mounts for cameras (not included).

The William Optics ZenithStar 81 APO Refractor is available in two colors,  Red or Gold. Choose the color of the telescope you wish to order from the drop-down menu above. All models have the same price. Includes a P-Flat6AIII Adjustable field Flattener (0.8X).

If you wish to take great astro-images with a high quality APO refractor, this William Optics ZenithStar 81 APO Telescope is a great way to obtain your imaging goals. Its FPL-53 glass air-spaced doublet lens design provides images with extreme sharpness, clear details, with APO grade color correction.

Includes a dual-spec Mounting Base (Vixen & Arca Swiss), 2.5" Dual-speed Rack and Pinion Focuser, CNC Carry Handle (with easy mount design for the optional guiding scope), clamshell type Mounting Rings for telescope, and the new innovative Bahtinov Mask cover. And this gem of a telescope is relatively small and easy to store or transport.

Introducing a first innovative feature in the industry: Now this ZenithStar 81 APO Telescope from William Optics comes standard with a dust cover that has a built-in, clear Bahtinov Mask for perfect focusing every time. Simply remove the flat front cover plate, leaving the dust cover cuff in place on the telescope. Point the telescope at a bright star, and focus carefully. When the bright central diffraction spike looks exactly centered between the other two spikes forming an "X", then your telescope is in exact focus for stars. Remove the dust cover cuff carefully from the objective end of the telescope, and you are ready to image.


Product Number: A-Z81xx-AP (Depends on Color Choice)
Telescope Type: Doublet Apochromatic Refractor
Objective Aperture: 81 mm
Focal Length: 559 mm
Focal Ratio: f/6.9
Focuser: 2.5" Dual-Speed R & P Focuser
Camera Format: Full Frame/APS-C Image Compatible
Tube Color: Red,or Gold
Tube Length: 460 mm (Fully Retracted), 560 mm (Extended)
Tube Weight: 3.53 kg W/ Rings & Dovetail
Included Flattener: Yes, Includes a P-Flat6AIII Flattener
T-Mount: Interchangable T-Mount Style for Compatibility
T-Rings: None, T-Rings are available as optional accessories